Dell Precision 5540 User manual

Latitude 5540
Technical Guidebook
Regulatory Model: P127F
Regulatory Type: P127F001
July 2023
Rev. A02

Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make better use of your product.
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid
the problem.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
© 2023 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, and other trademarks are trademarks of Dell Inc. or its
subsidiaries. Other trademarks may be trademarks of their respective owners.

Chapter 1: Views of Latitude 5540.................................................................................................5
Right....................................................................................................................................................................................... 5
Left..........................................................................................................................................................................................6
Top.......................................................................................................................................................................................... 7
Front....................................................................................................................................................................................... 8
Bottom................................................................................................................................................................................... 9
Service Tag........................................................................................................................................................................... 9
Battery charge and status light .....................................................................................................................................10
Chapter 2: Specifications of Latitude 5540.................................................................................. 11
Dimensions and weight......................................................................................................................................................11
Processor..............................................................................................................................................................................11
Chipset..................................................................................................................................................................................13
Operating system...............................................................................................................................................................13
Memory.................................................................................................................................................................................13
External ports......................................................................................................................................................................14
Internal slots........................................................................................................................................................................14
Ethernet............................................................................................................................................................................... 15
Wireless module..................................................................................................................................................................15
WWAN module....................................................................................................................................................................15
Audio......................................................................................................................................................................................17
Storage................................................................................................................................................................................. 17
Media-card reader ............................................................................................................................................................ 18
Keyboard.............................................................................................................................................................................. 18
Keyboard function keys.................................................................................................................................................... 18
Camera................................................................................................................................................................................. 19
Touchpad.............................................................................................................................................................................20
Power adapter................................................................................................................................................................... 20
Battery..................................................................................................................................................................................21
Display.................................................................................................................................................................................. 23
Fingerprint reader (optional).......................................................................................................................................... 24
Sensor ................................................................................................................................................................................. 24
GPU—Integrated.............................................................................................................................................................. 24
GPU—Discrete.................................................................................................................................................................. 24
External display support.................................................................................................................................................. 25
Hardware security.............................................................................................................................................................25
Smart-card reader.............................................................................................................................................................25
Contactless smart-card reader................................................................................................................................ 25
Contacted smart-card reader...................................................................................................................................27
Operating and storage environment............................................................................................................................. 27
Chapter 3: Engineering specifications......................................................................................... 29
Ethernet...............................................................................................................................................................................29
Intel Ethernet Connection i219-LM.........................................................................................................................29
Contents
Contents 3

Wireless module.................................................................................................................................................................30
Realtek RTL8852BE, 2x2, Wi-Fi 6 (Wi-Fi 802.11 a/b/g/n/ac/ax), Bluetooth 5.3 wireless card............ 30
Intel AX211, 2x2 MIMO, 2400 Mbps, 2.4/5/6 GHz, Wi-Fi 6E (WiFi 802.11ax), Bluetooth 5.3
wireless card..............................................................................................................................................................31
WWAN module...................................................................................................................................................................32
Intel XMM 7560 R Global LTE-Advanced ............................................................................................................ 32
Intel 5000 Global 5G Modem .................................................................................................................................. 33
GPU—Integrated.............................................................................................................................................................. 33
Intel Iris XeGraphics................................................................................................................................................... 33
Intel UHD Graphics......................................................................................................................................................34
Video port and resolution matrix................................................................................................................................... 34
Storage................................................................................................................................................................................ 35
M.2 2230, 256 GB, PCIe NVMe Gen4 x4, Class 35 SSD.................................................................................. 35
M.2 2230, 512 GB, PCIe NVMe Gen4 x4, Class 35 SSD................................................................................... 35
M.2 2230, 1 TB, PCIe NVMe Gen4 x4, Class 35 SSD.........................................................................................36
M.2 2230, 2 TB, PCIe NVMe Gen4 x4, Class 25 SSD........................................................................................36
M.2 2230, 256 GB, PCIe NVMe Gen4 x4, Opal Self-Encrypting, Class 35 SSD..........................................37
M.2 2280, 512 GB, PCIe NVMe Gen4 x4, Class 40 SSD................................................................................... 38
M.2 2280, 1 TB, PCIe NVMe Gen4 x4, Class 40 SSD.........................................................................................38
Power adapter....................................................................................................................................................................39
Accessories.........................................................................................................................................................................40
Security................................................................................................................................................................................40
Software security........................................................................................................................................................40
Fingerprint reader.........................................................................................................................................................41
Dell ControlVault 3.0 .................................................................................................................................................. 41
Trusted Platform Module........................................................................................................................................... 41
Thermal and acoustic improvements............................................................................................................................42
System management features....................................................................................................................................... 42
Dell Client Command Suite for In-Band systems management ...................................................................... 42
Out of Band Systems Management........................................................................................................................43
Chapter 4: ComfortView Plus...................................................................................................... 44
Chapter 5: Using the privacy shutter...........................................................................................45
Chapter 6: Dell Optimizer............................................................................................................ 46
Chapter 7: Color, material, and finish ......................................................................................... 47
Chapter 8: Getting help and contacting Dell................................................................................ 48
4 Contents

Views of Latitude 5540
Right
1. microSD-card slot
Reads from and writes to the microSD-card.
2. Universal audio jack
Connect headphones or a headset (headphone and microphone combo).
3. USB 3.2 Gen 1 port
Connect devices such as external storage devices and printers. Provides data transfer speeds up to 5 Gbps.
4. USB 3.2 Gen 1 port with PowerShare
Connect devices such as external storage devices and printers.
Provides data transfer speeds up to 5 Gbps. PowerShare enables you to charge your USB devices even when your computer
is turned off.
NOTE: If the charge on your computer’s battery is less than 10 percent, you must connect the power adapter to charge
your computer, and USB devices connected to the PowerShare port.
NOTE: If a USB device is connected to the PowerShare port before the computer is turned off or in hibernate state,
you must disconnect and connect it again to enable charging.
NOTE: Certain USB devices may not charge when the computer is turned off or in sleep state. In such cases, turn on
the computer to charge the device.
5. HDMI 2.0 port
Connect to a TV, external display or another HDMI-in enabled device. Provides video and audio output.
6. Network port
Connect an Ethernet (RJ-45) cable from a router or a broadband modem for network or Internet access, with a transfer rate
of 10/100/1000 Mbps.
7. Security-cable slot (wedge-shaped)
Connect a security cable to prevent unauthorized movement of your computer.
1
Views of Latitude 5540 5

Left
1. Thunderbolt 4.0 port with Power Delivery and DisplayPort
Supports USB4, DisplayPort 1.4, Thunderbolt 4 and also enables you to connect to an external display using a display adapter.
Provides data transfer rates of up to 40 Gbps for USB4 and Thunderbolt 4.
NOTE: You can connect a Dell Docking Station to the Thunderbolt 4 ports. For more information, search in the
Knowledge Base Resource at www.dell.com/support.
NOTE: A USB Type-C to DisplayPort adapter (sold separately) is required to connect a DisplayPort device.
NOTE: USB4 is backward compatible with USB 3.2, USB 2.0, and Thunderbolt 3.
NOTE: Thunderbolt 4 supports two 4K displays or one 8K display.
2. Thunderbolt 4.0 port with Power Delivery and DisplayPort
Supports USB4, DisplayPort 1.4, Thunderbolt 4 and also enables you to connect to an external display using a display adapter.
Provides data transfer rates of up to 40 Gbps for USB4 and Thunderbolt 4.
NOTE: You can connect a Dell Docking Station to the Thunderbolt 4 ports. For more information, search in the
Knowledge Base Resource at www.dell.com/support.
NOTE: A USB Type-C to DisplayPort adapter (sold separately) is required to connect a DisplayPort device.
NOTE: USB4 is backward compatible with USB 3.2, USB 2.0, and Thunderbolt 3.
NOTE: Thunderbolt 4 supports two 4K displays or one 8K display.
3. Battery-status light
Indicates the battery-charge status.
Solid yellow—Battery charge is low.
Blinking yellow—Battery charge is critical.
4. Smart-card reader slot (optional)
6 Views of Latitude 5540

Top
1. Power button with optional fingerprint reader
Press to turn on the computer if it is turned off, in sleep state, or in hibernate state.
When the computer is turned on, press the power button to put the computer into sleep state; press and hold the power
button for 10 seconds to force shut-down the computer.
If the power button has a fingerprint reader, place your finger on the power button steadily to log in.
NOTE: The power-status light on the power button is available only on computers without the fingerprint reader.
Computers that are shipped with the fingerprint reader that is integrated on the power button will not have the
power-status light on the power button.
NOTE: You can customize the power-button behavior in Windows.
2. Keyboard
3. Fingerprint reader (optional)
Press your finger on the fingerprint reader to log in to your computer. The fingerprint reader enables your computer to
recognize your fingerprints as a password.
NOTE: Configure the fingerprint reader to register your fingerprint and enable access.
4. NFC/Contactless smart card reader (optional)
5. Touchpad
Move your finger on the touchpad to move the mouse pointer. Tap to left-click and two fingers tap to right-click.
Views of Latitude 5540 7

Front
1. Left microphone
Provides digital sound input for audio recording and voice calls.
2. Infrared emitter (optional)
Emits infrared light, which enables the infrared camera to sense and track motion.
3. Infrared camera (optional)
Enhances security when paired with Windows Hello face authentication.
4. Camera shutter
Slide the privacy shutter to the left to access the camera lens.
5. Camera
Enables you to video chat, capture photos, and record videos.
6. Camera-status light
Turns on when the camera is in use.
7. Ambient-light sensor
The sensor detects the ambient light and automatically adjusts the display brightness.
8. Right microphone
Provides digital sound input for audio recording and voice calls.
8 Views of Latitude 5540

Bottom
1. Speakers
Provide audio output.
2. Service Tag label
The Service Tag is a unique alphanumeric identifier that enables Dell service technicians to identify the hardware
components in your computer and access warranty information.
3. Fan vents
Service Tag
The service tag is a unique alphanumeric identifier that allows Dell service technicians to identify the hardware components in
your computer and access warranty information.
Views of Latitude 5540 9

Battery charge and status light
The following table lists the battery charge and status light behavior of your Latitude 5540.
Table 1. Battery charge and status light behavior
Power Source LED Behavior System Power State Battery Charge Level
AC Adapter Off S0 - S5 Fully Charged
AC Adapter Solid White S0 - S5 < Fully Charged
Battery Off S0 - S5 11-100%
Battery Solid Amber (590+/-3 nm) S0 - S5 < 10%
●S0 (ON) - System is turned on.
●S4 (Hibernate) - The system consumes the least power compared to all other sleep states. The system is almost at an OFF
state, expect for a trickle power. The context data is written to hard drive.
●S5 (OFF) - The system is in a shutdown state.
10 Views of Latitude 5540

Specifications of Latitude 5540
Dimensions and weight
The following table lists the height, width, depth, and weight of your Latitude 5540.
Table 2. Dimensions and weight
Description Values
Height:
Front height 20.80 mm (0.82 in.)
Rear height 22.80 mm (0.90 in.)
Width 357.80 mm (14.09 in.)
Depth 233.30 mm (9.19 in.)
Weight
NOTE: The weight of your computer depends on the
configuration ordered and manufacturing variability.
1.613 kg (3.56 lb)
Processor
The following table lists the details of the processors supported by your Latitude 5540.
2
Specifications of Latitude 5540 11

Table 3. Processor
Description Option one Option two Option three Option four Option
five
Option six Option
seven
Option
eight
Processor
type 13th
Generation
Intel Core
i3-1315U
13th
Generation
Intel Core
i5-1335U
13th
Generation
Intel Core
i5-1345U
vPro
13th
Generation
Intel Core
i5-1340P
13th
Generation
Intel Core
i5-1350P
vPro
13th
Generation
Intel Core
i7-1355U
13th
Generation
Intel Core
i7-1365U
vPro
13th
Generation
Intel Core
i7-1370P
vPro
Processor
wattage 15 W 15 W 15 W 28 W 28 W 15 W 15 W 28 W
Processor
total core
count
6 10 10 12 12 10 10 14
Performance
-cores 2 2 2 4 4 2 2 6
Efficient-
cores 4 8 8 8 8 8 8 8
Processor
total thread
counts
8 12 12 16 16 12 12 20
NOTE: Intel® Hyper-Threading Technology is only available on Performance-cores.
Processor
speed Up to 4.50
GHz
Up to 4.60
GHz
Up to 4.70
GHz
Up to 4.60
GHz
Up to 4.70
GHz
Up to 5
GHz
Up to 5.20
GHz
Up to 5.20
GHz
Performance-cores frequency
Processor
base
frequency
1.20 GHz 1.30 GHz 1.60 GHz 1.90 GHz 1.90 GHz 1.70 GHz 1.80 GHz 1.90 GHz
Maximum
turbo
frequency
4.50 GHz 4.60 GHz 4.70 GHz 4.60 GHz 4.70 GHz 5 GHz 5.20 GHz 5.20 GHz
Efficient-cores frequency
Processor
base
frequency
0.90 GHz 0.90 GHz 1.20 GHz 1.40 GHz 1.40 GHz 1.20 GHz 1.30 GHz 1.40 GHz
Maximum
turbo
frequency
3.30 GHz 3.40 GHz 3.50 GHz 3.40 GHz 3.50 GHz 3.70 GHz 3.90 GHz 3.90 GHz
Processor
cache 10 MB 12 MB 12 MB 12 MB 12 MB 12 MB 12 MB 24 MB
Integrated
graphics Intel UHD
Graphics
Intel Iris Xe
Graphics
Intel Iris Xe
Graphics
Intel Iris Xe
Graphics
Intel Iris Xe
Graphics
Intel Iris Xe
Graphics
Intel Iris Xe
Graphics
Intel Iris Xe
Graphics
12 Specifications of Latitude 5540

Chipset
The following table lists the details of the chipset supported by your Latitude 5540.
Table 4. Chipset
Description Values
Chipset Integrated in the processor
Processor 13thGeneration Intel Core i3/i5/i7
DRAM bus width 64-bit
Flash EPROM 32 MB for non-vPro, 32 MB + 16 MB for vPro/vPro Essentials
PCIe bus Up to Gen 4
Operating system
Your Latitude 5540 supports the following operating systems:
●Windows 11 Home, 64-bit
●Windows 11 Pro, 64-bit
●Windows 11 Pro downgrade (Win 10 Pro image FI + Win 11 Pro DPK)
●Ubuntu 22.04 LTS, 64-bit
Memory
The following table lists the memory specifications of your Latitude 5540.
Table 5. Memory specifications
Description Values
Memory slots Two-SODIMM slots
Memory type ●Single-channel DDR4
●Dual-channel DDR4
●Single-channel DDR5
●Dual-channel DDR5
Memory speed ●3200 MT/s
●4800 MT/s
Maximum memory configuration 64 GB
Minimum memory configuration 8 GB
Memory size per slot 8 GB, 16 GB, or 32 GB
Memory configurations supported ●8GB, 1 x 8 GB, DDR4, 3200 MT/s, single-channel
●16 GB, 2 x 8 GB, DDR4, 3200 MT/s, dual-channel
●16 GB, 1 x 16 GB, DDR4, 3200 MT/s, single-channel
●32 GB, 2 x 16 GB, DDR4, 3200 MT/s, dual-channel
●64 GB, 2 x 32 GB, DDR4, 3200 MT/s, dual-channel
●8 GB, 1 x 8 GB, DDR5, 4800 MT/s, single-channel
Specifications of Latitude 5540 13

Table 5. Memory specifications(continued)
Description Values
●16 GB, 2 x 8 GB, DDR5, 4800 MT/s, dual-channel
●16 GB, 1 x 16 GB, DDR5, 4800 MT/s, single-channel
●32 GB, 2 x 16 GB, DDR5, 4800 MT/s, dual-channel
●64 GB, 2 x 32 GB, DDR5, 4800 MT/s, dual-channel
External ports
The following table lists the external ports of your Latitude 5540.
Table 6. External ports
Description Values
Network port One RJ-45 port
USB ports ●Two Thunderbolt 4 port Power Delivery and DisplayPort
NOTE: You can connect a Dell Docking Station to this
port. For more information, search in the Knowledge
Base Resource at www.dell.com/support.
●One USB 3.2 Gen 1 port with PowerShare
●One USB 3.2 Gen 1 port
Audio port One Universal audio jack
Video port One HDMI 2.0 port
Media-card reader One microSD-card slot
Power-adapter port USB Type-C power input
Security-cable slot One security-cable slot (wedge-shaped)
Internal slots
The following table lists the internal slots of your Latitude 5540.
Table 7. Internal slots
Description Values
M.2 ●One M.2 2230 slot for WiFi and Bluetooth combo card
●One M.2 2230/2280 slot for solid-state drive
●One M.2 2230 slot for solid-state drive
●One M.2 3042/3052 for WWAN card
NOTE: To learn more about the features of different
types of M.2 cards, search in the Knowledge Base
Resource at www.dell.com/support.
14 Specifications of Latitude 5540

Ethernet
The following table lists the wired Ethernet Local Area Network (LAN) specifications of your Latitude 5540.
Table 8. Ethernet specifications
Description Values
Model number Intel I219-V/Intel I219-LM
Transfer rate 10/100/1000 Mbps
Wireless module
The following table lists the Wireless Local Area Network (WLAN) modules that are supported on your Latitude 5540.
Table 9. Wireless module specifications
Description Option one Option two
Model number Realtek RTL8852BE Intel AX211
Transfer rate Up to 1201 Mbps Up to 2400 Mbps
Frequency bands supported 2.4 GHz/5 GHz 2.4 GHz/5 GHz/6 GHz
Wireless standards ●WiFi 802.11a/b/g
●Wi-Fi 4 (WiFi 802.11n)
●Wi-Fi 5 (WiFi 802.11ac)
●Wi-Fi 6 (WiFi 802.11ax)
●WiFi 802.11a/b/g
●Wi-Fi 4 (WiFi 802.11n)
●Wi-Fi 5 (WiFi 802.11ac)
●Wi-Fi 6E (WiFi 802.11ax)
NOTE:
Wi-Fi 6 is supported in regions
where Wi-Fi 6E is unavailable.
Encryption ●64-bit/128-bit WEP
●AES-CCMP
●TKIP
●64-bit/128-bit WEP
●AES-CCMP
●TKIP
Bluetooth wireless card Bluetooth 5.3 Bluetooth 5.3
NOTE: The version of the Bluetooth wireless card may vary depending on the
operating system that is installed on your computer.
WWAN module
The following table lists the Wireless Wide Area Network (WWAN) module supported on your Latitude 5540.
Table 10. WWAN module specifications
Description Option one Option two
Model number DW5823, Intel XMM 7560 R Global LTE-
Advanced, CAT16
DW5931e, Intel 5G 5000 Global Gigabit
NR/LTE, 3GPP Release 15
Form factor M.2 3042 Key-B M.2 3042 Key-B
Host interface PCIe Gen2 PCIe Gen3
Specifications of Latitude 5540 15

Table 10. WWAN module specifications(continued)
Description Option one Option two
Network standard LTE FDD/TDD, WCDMA/HSPA+,GPS/
GLONASS/BDS/Galileo
NR FR1(Sub6) FDD/TDD, LTE FDD/
TDD, WCDMA/HSPA+, GPS/GLONASS/
Galileo/BDS/QZSS
Transfer data rate ●Up to 1 Gbps DL (CAT16)
●Up 150 Mbps UL
●SA: DL 4.67 Gbps/UL 1.25 Gbps
●NSA: DL 3.74 Gbps/UL 700 Mbps
●LTE: DL 1.6 Gbps (CAT19)/UL 150
Mbps
●UMTS: DL 384 kbps/UL 384 kbps
DL DC-HSPA+: 42 Mbps (CAT24)/UL
11.5 Mbps (CAT7)
Operating frequency bands ●LTE(B1, B2, B3, B4, B5, B7, B8, B12,
B13, B14, B17, B18, B19, B20, B25, B26,
B28, B29, B30, B32, B34, B38, B39,
B40, B41(HPUE), B42, B43, B46(receiver
only), B48, B66, B71
●WCDMA/HSPA+(1, 2, 4, 5, 8)
●NR(n1, n2, n3, n5, n7, n8, n20, n25,
n28, n30, n38, n40, n41, n48, n66, n71,
n77, n78, n79)
●LTE (B1, B2, B3, B4, B5, B7, B8, B12,
B13, B14, B17, B18, B19, B20, B25,
B26, B28, B29, B30, B32, B34, B38,
B39, B40, B41, B42, B43, B46, B48,
B66, B71*)
●WCDMA/HSPA+ (1, 2, 4, 5, 8)
Power supply DC 3.135 V to 4.40 V, typical 3.30 V DC 3.135 V to 4.4 V, Typical 3.3 V
SIM card Supported through external SIM slot Supported through external SIM slot
eSIM with dual SIM (DSSA) Supported (the availability of eSIM
functionality embedded on the module is
dependent on the region and specific carrier
requirements)
Supported
Antenna diversity Supported Supported
Radio On/Off Supported Supported
Wake on wireless Supported Supported
Temperature ●Normal operating temperature: -10°C to
+ 55°C
●Extended Operating temperature: -20°C
to +65°C
●Normal operating temperature: -10°C
to + 55°C
●Extended Operating temperature:
-30°C to +75°C
●Storage temperature: -40°C to
+85°C
Antenna connector ●WWAN Main Antenna x 4
●Supports 4x4 MIMO
●WWAN Main Antenna x 4
●Supports 4x4 MIMO
NOTE: For instructions on how to find your computer's IMEI (International Mobile Station Equipment Identity) number,
search in the Knowledge Base Resource at www.dell.com/support.
16 Specifications of Latitude 5540

Audio
The following table lists the audio specifications of your Latitude 5540.
Table 11. Audio specifications
Description Values
Audio controller Realtek Waves, MaxxAudio 12.0
Stereo conversion Supported
Internal audio interface High definition audio interface
External audio interface Universal Audio Jack/HDMI 2.0 port
Number of speakers 2
Internal-speaker amplifier Not supported
External volume controls Keyboard shortcut controls
Speaker output:
Average speaker output 2 W
Peak speaker output 2 W
Subwoofer output Not supported
Microphone Digital-array microphones in camera assembly
Storage
This section lists the storage options on your Latitude 5540.
Your Latitude 5540 supports one of the following options
●One M.2 2230/2280 solid-state drive or optional dual storage
NOTE: SSD Slot 1 on the system board supports M.2 2230 or M.2 2280 solid-state drives.
NOTE: SSD Slot 2 on the system board only supports M.2 2230 solid-state drives.
●One M.2 2230 self-encrypting drive
Table 12. Storage specifications
Storage type Interface type Capacity
M.2 2230 solid-state drive PCIe Gen4 x4 NVMe, up to 64 Gbps Up to 2 TB
M.2 2280 solid-state drive PCIe Gen4 x4 NVMe, up to 64 Gbps Up to 1 TB
M.2 2230 self-encrypting drive PCIe Gen4 x4 NVMe, up to 64 Gbps Up to 256 GB
Specifications of Latitude 5540 17

Media-card reader
The following table lists the media-card reader specifications of your Latitude 5540.
Table 13. Media-card reader (standard offering)
Media supported (Maximum capacity supported will vary by Flash Media Types)
Media Supported Micro Secure Digital (mSD)
Micro Secure Digital High Capacity (mSDHC)
Micro Secure Digital Extended Capacity (mSDXC)
Support Specification Versions microSD 4.0 card
Keyboard
The following table lists the keyboard specifications of your Latitude 5540.
Table 14. Keyboard specifications
Description Values
Keyboard type ●Standard backlit keyboard
●Standard non-backlit keyboard
Keyboard layout QWERTY
Number of keys ●English US, English International, Arabic, Canada bilingual
(MUI), Chinese traditional, French-Canadian, Greek,
Hebrew, Korean, Russian, Thai, Ukrainian: 99 keys
●French-Canadian Quebec, Brazilian, Belgian, Bulgarian,
Czech & Slovakian (MUI), Danish, English UK, Estonian,
French European, German, Hungarian, Italian, Nordic
(MUI), Norwegian, Portugese Iberian, Slovenian, Spanish
(Castillian), Spanish (Latin America), Swedish/Finnish,
Swiss European (MUI), Turkish, Turkish F: 100 keys
●Japanese: 103 keys
Keyboard size X= 18.05 mm key pitch
Y= 18.05 mm key pitch
Key distance (Key size: X/Y) X=15.05 mm
Y=15.05 mm
Keyboard shortcuts Some keys on your keyboard have two symbols on them.
These keys can be used to type alternate characters or to
perform secondary functions. To type the alternate character,
press Shift and the desired key. To perform secondary
functions, press Fn and the desired key.
NOTE: You can define the primary behavior of the
function keys (F1–F12) by changing Function Key
Behavior in the BIOS setup program.
Keyboard function keys
The F1-F12 keys at the top of the keyboard are function keys. By default, these keys are used to perform specific functions
defined by the software application in use.
18 Specifications of Latitude 5540

You can run the secondary tasks that are indicated by the symbols on the function keys by pressing the function key with fn, for
example, fn and F1. See the table below for the list of secondary tasks and the key combinations to run them.
NOTE: Keyboard characters may differ depending on the keyboard language configuration. Keys that are used for tasks
remain the same, regardless of the keyboard language.
NOTE: You can define the primary behavior of function keys in the Function Key Behavior menu of the BIOS setup
program.
Table 15. Secondary tasks of keyboard keys
Key combination for task What the task does
fn and F1 Operating system and application specific F1 behavior
fn and F2 Operating system and application specific F2 behavior
fn and F3 Operating system and application specific F3 behavior
fn and F4 Operating system and application specific F4 behavior
fn and F5 Operating system and application specific F5 behavior
fn and F6 Operating system and application specific F6 behavior
fn and F8 Operating system and application specific F8 behavior
fn and F9 Operating system and application specific F9 behavior
fn and F10 Operating system and application specific F10 behavior
fn and F11 Operating system and application specific F11 behavior
fn and F12 Operating system and application specific F12 behavior
fn and Right Ctrl Open application menu
fn and Cursor up Page up
fn and Cursor down Page down
Keys with alternate characters
There are other keys on your keyboard with alternate characters. The symbols that are shown at the bottom of these keys
are the main characters that are displayed when the key is pressed; the symbols that are shown at the top of these keys are
displayed when the key is pressed with the shift key. For example, if you press 2, 2is displayed; if you press Shift and 2, @is
displayed.
Camera
The following table lists the camera specifications of your Latitude 5540.
Table 16. Camera specifications
Description Values
Number of cameras One
Camera type ●FHD RGB camera
●FHD RGB + IR camera
●FHD RGB+IR camera with Ambient Light Sensor, Express
Sign-In with Presence Detection and Intelligent Privacy
Camera location Front camera
Camera sensor type CMOS sensor technology
Specifications of Latitude 5540 19

Table 16. Camera specifications(continued)
Description Values
Camera resolution:
Still image 2.07 megapixel
Video 1920 x 1080 (FHD) at 30 fps
Infrared camera resolution:
Still image 0.23 megapixels
Video 640 x 360 at 30 fps
Diagonal viewing angle:
Camera 80 degrees
Infrared camera 86.6 degrees
Touchpad
The following table lists the touchpad specifications of your Latitude 5540.
Table 17. Touchpad specifications
Description Values
Touchpad resolution: >300 DPI
Touchpad dimensions:
Horizontal 115 mm (4.52 in.)
Vertical 67 mm (2.64 in.)
Touchpad gestures For more information about touchpad gestures available on:
●Windows, see the Microsoft knowledge base article at
support.microsoft.com
●Ubuntu, see ubuntu.com/support
Power adapter
The following table lists the power adapter specifications of your Latitude 5540.
Table 18. Power adapter specifications
Description Option one Option two Option three
Type ●60 W AC adapter, USB-C
●60 W AC adapter, USB-C,
2-pin
65 W AC adapter 100 W AC adapter, USB-C
Input voltage 100 VAC–240 VAC 100 VAC–240 VAC 100 VAC–240 VAC
Input frequency 50 Hz–60 Hz 50 Hz–60 Hz 50 Hz–60 Hz
Input current (maximum) 1.70 A 1.70 A 1.70 A
20 Specifications of Latitude 5540