Quectel UG89 Supplement

UG89
Hardware Design
UMTS/HSPA+ Module Series
Rev. UG89_Hardware_Design_V1.0
Date: 2020-07-12
Status: Preliminary
www.quectel.com

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About the Document
History
Revision
Date
Author
Description
1.0
2020-07-12
Woody
Initial

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Contents
About the Document.................................................................................................................................. 2
Contents...................................................................................................................................................... 3
Table Index.................................................................................................................................................. 5
Figure Index................................................................................................................................................ 6
1Introduction......................................................................................................................................... 7
1.1. Safety Information..................................................................................................................... 8
2Product Concept................................................................................................................................. 9
2.1. General Description.................................................................................................................. 9
2.2. Key Features .......................................................................................................................... 10
2.3. Functional Diagram ................................................................................................................ 12
2.4. Evaluation Board .................................................................................................................... 13
3Application Interfaces ...................................................................................................................... 14
3.1. General Description................................................................................................................ 14
3.2. Pin Assignment....................................................................................................................... 15
3.3. Pin Description........................................................................................................................ 16
3.4. Operating Modes.................................................................................................................... 22
3.5. Power Supply.......................................................................................................................... 23
3.5.1. Power Supply Pins........................................................................................................ 23
3.5.2. Decrease Voltage Drop................................................................................................. 23
3.5.3. Reference Design for Power Supply............................................................................. 24
3.6. Power-on/off/Reset Scenarios................................................................................................ 25
3.6.1. Turn on the Module Using the PWRKEY...................................................................... 25
3.6.2. Turn off the Module....................................................................................................... 27
3.6.2.1. Turn off the Module Using the PWRKEY Pin...................................................... 28
3.6.2.2. Turn off Module UsingAT Command.................................................................. 28
3.6.3. Reset the Module.......................................................................................................... 28
3.6.4. Automatic Shutdown*.................................................................................................... 30
3.6.4.1. Thermal Shutdown* ............................................................................................ 30
3.6.4.2. Undervoltage Shutdown*.................................................................................... 31
3.6.4.3. Overvoltage Shutdown*...................................................................................... 32
3.7. UART Interfaces..................................................................................................................... 32
3.8. (U)SIM Interface ..................................................................................................................... 35
3.9. USB Interface ......................................................................................................................... 37
3.10. ADC Interfaces ....................................................................................................................... 38
3.11. PCM and I2C Interfaces......................................................................................................... 39
3.12. STATUS.................................................................................................................................. 41
3.13. Behaviors of the UART1_RI................................................................................................... 42
4Antenna Interface.............................................................................................................................. 44
4.1. GSM/UMTSAntenna Interface............................................................................................... 44
4.1.1. Pin Definition................................................................................................................. 44

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4.1.2. Operating Frequency .................................................................................................... 44
4.1.3. Reference Design of RF Antenna Interface.................................................................. 45
4.1.4. Reference Design of RF Layout.................................................................................... 45
4.2. Antenna Installation................................................................................................................ 48
4.2.1. Antenna Requirements................................................................................................. 48
4.2.2. Recommended RF Connector for Antenna Installation................................................ 48
5Electrical, Reliability and Radio Characteristics........................................................................... 50
5.1. Absolute Maximum Ratings.................................................................................................... 50
5.2. Power Supply Ratings............................................................................................................ 51
5.3. Operation and Storage Temperatures.................................................................................... 51
5.4. Current Consumption ............................................................................................................. 52
5.5. RF Output Power.................................................................................................................... 54
5.6. RF Receiving Sensitivity......................................................................................................... 54
5.7. Electrostatic Discharge........................................................................................................... 55
6Mechanical Dimensions................................................................................................................... 56
6.1. Mechanical Dimensions of the Module................................................................................... 56
6.2. Recommended Footprint Design............................................................................................ 58
6.3. Top and Bottom Views of the Module..................................................................................... 59
7Storage, Manufacturing and Packaging......................................................................................... 61
7.1. Storage ................................................................................................................................... 61
7.2. Manufacturing and Soldering ................................................................................................. 62
7.3. Packaging............................................................................................................................... 63
8Appendix A References.................................................................................................................... 64
9Appendix B GPRS Coding Schemes.............................................................................................. 68
10 Appendix C GPRS Multi-slot Classes............................................................................................. 69
11 Appendix D EDGE Modulation and Coding Schemes .................................................................. 71
12 Appendix E Certification List........................................................................................................... 72

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Table Index
Table 1: UG89 Frequency Bands................................................................................................................. 9
Table 2: P/N Information...............................................................................................................................9
Table 3: Key Features of UG89 Module..................................................................................................... 10
Table 4: I/O Parameters Definition.............................................................................................................16
Table 5: Pin Description .............................................................................................................................16
Table 6: Overview of Operating Modes...................................................................................................... 22
Table 7: VBAT and GND Pins .................................................................................................................... 23
Table 8: Pin Description of PWRKEY.........................................................................................................25
Table 9: Pin Description of RESET_N........................................................................................................29
Table 10: Temperature dependent behavior.............................................................................................. 31
Table 11: Pin Definition of the UART1 Interface.........................................................................................32
Table 12: Pin Definition of the Debug UART Interface...............................................................................33
Table 13: Logic Levels of Digital I/O........................................................................................................... 33
Table 14: Pin Definition of the (U)SIM Card Interface................................................................................ 35
Table 15: Pin Description of USB Interface................................................................................................37
Table 16: Pin Definition of theADC Interfaces...........................................................................................39
Table 17: Characteristic of theADC........................................................................................................... 39
Table 18: Pin Definition of PCM and I2C Interfaces .................................................................................. 40
Table 19: Pin Definition of STATUS............................................................................................................ 41
Table 20: Behaviors of the UART1_RI.......................................................................................................43
Table 21: Pin Definition of RFAntenna...................................................................................................... 44
Table 22: Module Operating Frequencies..................................................................................................44
Table 23: Antenna Requirements............................................................................................................... 48
Table 24:Absolute Maximum Ratings........................................................................................................50
Table 25: The Module Power Supply Ratings............................................................................................51
Table 26: Operation and Storage Temperatures........................................................................................51
Table 27: UG89 Current Consumption.......................................................................................................52
Table 28: RF Output Power........................................................................................................................54
Table 29：UG89 Conducted RF Receiving Sensitivity.............................................................................. 54
Table 30: Electrostatics Discharge Characteristics (Temperature=25 ºC, Humidity=45%).......................55
Table 31: Recommended Thermal Profile Parameters.............................................................................. 62
Table 32: Related Documents.................................................................................................................... 64
Table 33: Terms and Abbreviations............................................................................................................ 64
Table 34: Description of Different Coding Schemes..................................................................................68
Table 35: GPRS Multi-slot Classes............................................................................................................ 69
Table 36: EDGE Modulation and Coding Schemes................................................................................... 71
Table 37: Certification List.......................................................................................................................... 72

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Figure Index
Figure 1: Functional Diagram.....................................................................................................................13
Figure 2: PinAssignment (Bottom View) ................................................................................................... 15
Figure 3: Voltage Drop during Burst Transmission....................................................................................24
Figure 4: Star Structure of the Power Supply............................................................................................24
Figure 5: Reference Circuit of Power Supply............................................................................................. 25
Figure 6: Reference Circuit of Turing on the Module Using Driving Circuit............................................... 26
Figure 7: Reference Circuit of Turing on the Module Using Keystroke..................................................... 26
Figure 8: Timing of Turning on the Module................................................................................................ 27
Figure 9: Timing of Turning off the Module................................................................................................ 28
Figure 10: Reference Circuit of Resetting the Module by Using Driving Circuit........................................29
Figure 11: Reference Circuit of Resetting the Module by Using Button....................................................29
Figure 12: Timing of Resetting Module...................................................................................................... 30
Figure 13: Reference Circuit with a Level Translator Chip........................................................................ 34
Figure 14: Reference Circuit with a Transistor Circuit............................................................................... 34
Figure 15: Reference Circuit of (U)SIM Interface with an 8-pin (U)SIM Card Connector ......................... 36
Figure 16: Reference Circuit of (U)SIM Interface with a 6-pin (U)SIM Card Connector ...........................36
Figure 17: Reference Circuit of USB Application....................................................................................... 38
Figure 18: Primary Mode Timing................................................................................................................ 40
Figure 19: Reference Circuit of PCMApplication withAudio Codec.........................................................41
Figure 20: Reference Circuits of STATUS ................................................................................................. 42
Figure 21: Reference Circuit of RF Antenna Interface............................................................................... 45
Figure 22: Microstrip Design on a 2-layer PCB ......................................................................................... 46
Figure 23: Coplanar Waveguide Design on a 2-layer PCB.......................................................................46
Figure 24: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground).................... 46
Figure 25: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground).................... 47
Figure 26: Dimensions of the U.FL-R-SMT Connector (Unit: mm)............................................................48
Figure 27: Mechanicals of U.FL-LP Connectors........................................................................................49
Figure 28: Space Factor of Mated Connector (Unit: mm).......................................................................... 49
Figure 29: Module Top and Side Dimensions............................................................................................ 56
Figure 30: Module Bottom Dimensions (Top View).................................................................................... 57
Figure 31: Recommended Footprint (Top View)........................................................................................58
Figure 32: Top View of the Module............................................................................................................. 59
Figure 33: Bottom View of the Module.......................................................................................................59
Figure 34: Reflow Soldering Thermal Profile............................................................................................. 62

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1Introduction
This document defines UG89 module and describes its air interface and hardware interface which are
connected with customers’ applications.
This document helps customers quickly understand module interface specifications, electrical and
mechanical details, as well as other related information of UG89 module.Associated with application note
and user guide, customers can use UG89 module to design and set up mobile applications easily.

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1.1. Safety Information
The following safety precautions must be observed during all phases of operation, such as usage, service
or repair of any cellular terminal or mobile incorporating UG89 module. Manufacturers of the cellular terminal
should send the following safety information to users and operating personnel, and incorporate these
guidelines into all manuals supplied with the product. If not so, Quectel assumes no liability for customers’
failure to comply with these precautions.
Full attention must be given to driving at all times in order to reduce the risk of an
accident. Using a mobile while driving (even with a handsfree kit) causes
distraction and can lead to an accident. Please comply with laws and regulations
restricting the use of wireless devices while driving.
Switchoffthecellularterminalormobilebeforeboardinganaircraft.Theoperation
of wireless appliances in an aircraft is forbidden to prevent interference with
communication systems. If the device offers an Airplane Mode, then it should be
enabled prior to boarding an aircraft. Please consult the airline staff for more
restrictions on the use of wireless devices on boarding the aircraft.
Wireless devices may cause interference on sensitive medical equipment, so
please be aware of the restrictions on the use of wireless devices when in
hospitals, clinics or other healthcare facilities.
The cellular terminal or mobile contains a transmitter and receiver. When it is ON,
it receives and transmits radio frequency signals. RF interference can occur if it is
used close to TV set, radio, computer or other electric equipment.
In locations with potentially explosive atmospheres, obey all posted signs to turn
off wireless devices such as your phone or other cellular terminals. Areas with
potentially explosive atmospheres include fuelling areas, below decks on boats,
fuel or chemical transfer or storage facilities, areas where the air contains
chemicals or particles such as grain, dust or metal powders, etc.

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2Product Concept
2.1. General Description
UG89 is a WCDMA/GSM wireless communication module. Its general features are listed below：
Support HSDPA, HSUPA, HSPA+, WCDMA, EDGE, GSM and GPRS coverage.
Provide audio support for customers’ specific applications.
Table 1: UG89 Frequency Bands
With a compact profile of 27.6mm ×25.4mm ×2.2mm, UG89 can meet almost all requirements of M2M
applications such as wireless POS, metering, telematics, security, industry PDA/PC and tablet, etc.
UG89 is an SMD-type module, which can be embedded in application through its 120 LGA pins.
UG89 is integrated with internet service protocols like TCP, UDP and PPP. Extended AT commands have
been developed for customers to use these internet service protocols easily.
The following table shows the P/N information of UG89.
Table 2: P/N Information
Type
Frequency Bands
WCDMA
B1/B2/B5/B6/B8
GSM
850/900/1800/1900MHz
Part Description
VFI P/N
Quectel ordering P/N
UG89ASR –Blank IMEI
RAD268-024-01-A
UG89TA-128-VFI
UG89ASR –Quectel’s IMEI
RAD268-024-02-A
UG89TA-128-STD

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2.2. Key Features
The following table describes the detailed features of UG89 module.
Table 3: Key Features of UG89 Module
Feature
Details
Power Supply
Supply voltage: 3.3V~4.5V
Typical supply voltage: 3.8V
Transmitting Power
Class 4 (33dBm±2dB) for GSM850/EGSM900
Class 1 (30dBm±2dB) for DCS1800/PCS1900
Class E2 (27dBm±3dB) for GSM850/EGSM900 8-PSK
Class E2 (26dBm±3dB) for DCS1800/PCS1900 8-PSK
Class 3 (24dBm+1/-3dB) for WCDMA bands
UMTS Features
Support 3GPP R7 HSDPA, HSPA+, HSUPA and WCDMA
Support QPSK, 16-QAM (DL only) modulation
HSPA+: Max 21Mbps (DL)
HSUPA: Max 5.76Mbps (UL)
WCDMA: Max 384Kbps (DL), Max 384Kbps (UL)
GSM Features
GPRS
Support GPRS multi-slot class 12
Coding schemes: CS-1, CS-2, CS-3 and CS-4
Max 85.6Kbps (DL), Max 85.6Kbps (UL)
EDGE
Support EDGE multi-slot class 12
Support GMSK and 8-PSK for different MCS (Modulation and Coding
Scheme)
Downlink coding schemes: CS 1-4 and MCS 1-9
Uplink coding schemes: CS 1-4 and MCS 1-9
Max 236.8Kbps (DL), Max 236.8Kbps (UL)
Internet Protocol
Features
Support TCP/UDP/PPP/NTP/NITZ/FTP/HTTP/PING/CMUX/HTTPS/FTPS/
SSL/FILE/MQTT/SMTP*/MMS*/SMTPS* protocols
Support PAP (Password Authentication Protocol) and CHAP (Challenge
Handshake Authentication Protocol) protocols which as usually used for
PPP connection
SMS
Text and PDU modes
Point-to-point MO and MT
SMS cell broadcast
SMS storage: (U)SIM card currently
USIM Interface
Support USIM/SIM card: 1.8V/3.0V

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PCM Interface
Used for audio function with an external codec chip
Support 16-bit linear data format
Support short frame synchronization
Support master and slave modes
USB Interface
Compliant with USB 2.0 specification (slave only), with transmission rates up
to 480Mbps
Used for AT command communication, data transmission, software
debugging and firmware upgrade
Support USB serial drivers for:
Windows 7/8/8.1/10
Windows CE 5.0/6.0/7.0*
Linux 2.6~5.0
Android 4.x/5.x/6.x/7.x/8.x/9.x
UART Interface
UART1
Used for AT command communication and data transmission
Baud rate reach up to 1Mbps; 115200bps by default
Support RTS and CTS hardware flow control
UART2
Used for Linux console, log output
115200bps baud rate
I2C Interfaces
Compliant with I2C specification version 5.0
Multi-master is not supported
Used for codec configuration by default
AT Commands
Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT
commands
Real Time Clock
Support
Antenna Interface
GSM/UMTS antenna, 50Ω
Physical Characteristics
Size: (25.4±0.15)mm ×(27.6±0.15)mm ×(2.2±0.2)mm
Package: LGA
Weight: TBD
Temperature Range
Operation temperature range: -35°C ~ +75°C 1)
Extended temperature range: -40°C ~ +85°C 2)
Storage temperature range: -40°C ~ +90°C
Firmware Upgrade
USB interface or UART interface
RoHS
All hardware components are fully compliant with EU RoHS directive

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1. 1) Within the operation temperature range, the module is 3GPP compliant.
2. 2) Within the extended temperature range, the module remains the ability to establish and maintain
avoice,SMS,datatransmission,emergencycall,etc.Thereisnounrecoverablemalfunction.There
are also no effects on radio spectrum and no harm to radio network. Only one or more parameters
like Pout might reduce their value and exceed the specified tolerances. When the temperature
returns to the normal operating temperature levels, themodule willmeet 3GPP specifications again.
3. “*” means under development.
2.3. Functional Diagram
The following figure shows a block diagram of UG89 and illustrates the major functional parts.
RF transceiver
Baseband
Flash
Radio frequency
Peripheral interfaces
—UART interface
—(U)SIM interface
—USB interface
—PCM interface
—I2C interface
—Status indication
NOTES

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Baseband
PMIC
Transceiver FLASH
PA
PAM
ANT_MAIN
VBAT_BB
VBAT_RF
ADC
VDD_EXT USBPCM UARTsI2C
32K
XO
Control
IQ Control
Duplex
Tx
PRx
26M
VC_TXCO
STATUS
RAM
PWRKEY
RESET_N
VDD_EXT
(U)SIM GPIO
PON
Figure 1: Functional Diagram
2.4. Evaluation Board
In orderto help customerstodevelop applications with UG89, Quectelprovides an evaluation board (EVB),
USB to RS-232 converter cable, earphone, antenna and other peripherals to control or test the module.
For more details, please refer to document [4].

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3Application Interfaces
3.1. General Description
UG89 is equipped with 120 pins that can be connected to customers’cellular application platforms. Sub-
interfaces included in these pins are described in detail in the following chapters:
Power supply
UART interface
(U)SIM interface
USB interface
ADC interface
PCM and I2C interfaces
Status indication

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3.2. Pin Assignment
The following figure shows the pin assignment of UG89 module.
55
56
57
58
59
60
61
65
66
67
68
69
70
71
72
18 17 16 15 14 13
5 4 3 2 1
64
63
62
6
POWER USB UART (U)SIM
12
7 8
9
10 11
93
94
95
96
117
118
119
120
97
73
86 85
88 87
90 89
92 91
110 109
112 111
114 113
115
104 105
102 103
100 101
99
80 81
78 79
76 77
75
108
107
106
84
83
82
36
35
34
33
32
31
30
27
28
29
26
25
24
23
22
21
20
19
50 51 52 53 54
49
37 38 39 40 41 42
43
48 47
46
45 44
PWM1 / USB_BOOT 1)
GND
GND
GND
GND
GND
RESERVED
RESERVED
RESERVED
RESERVED
GPIO5
GND
ANT_MAIN
GND
COUNTER
VBAT
GND
GND
GPIO4
DBG_RTS
DBG_CTS
DBG_TXD
DBG_RXD
PCM_DOUT
VCORE
USIM_CLK
USIM_VDD
GPIO2
GPIO1
PCM_CLK
I2C_SDA
I2C_SCL
GPIO3
RESET_N
PCM_DIN
PCM_SYNC
RESERVED
GND
VBAT
ADC
PON
UART1_RI
UART1_RTS
RESERVED
USIM_RST
USIM_DET
USIM_DATA
UART1_TXD
VDD_EXT
GND
RESERVED
GND
UART1_CTS
UART1_RXD
PWM2
RESERVED
RESERVED
USB_DM
USB_DP
RESERVED
GND
RESERVED
GND
RESERVED
GND
UART1_DCD
UART1_DTR
USB_VBUS
STATUS
GND
UART1_DSR
RESERVED
74
98
PWRKEY
116
OTHERS
GND RESERVED PCM ANT
Figure 2: Pin Assignment (Bottom View)
1. If PCM_CLK, and I2C_SCL are not used, it is recommended to mount a 33pF capacitor close to
each of the three pins to prevent interference from affecting RF’s performance. Other unused pins
and RESERVED pins should be kept open, and all GND pins should be connected to the ground.
1) means that these pins cannot be pulled up before startup.
NOTES

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3.3. Pin Description
The following tables show the pin definition of UG89 module.
Table 4: I/O Parameters Definition
Table 5: Pin Description
Type
Description
AI
Analog Input
AO
Analog Output
DI
Digital Input
DO
Digital Output
IO
Bidirectional
OD
Open Drain
PI
Power Input
PO
Power Output
Power Supply
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
VBAT
4, 57
PI
Power supply for
module
Vmax=4.5V
Vmin=3.3V
Vnorm=3.8V
It must be able to
provide sufficient
current in a
transmitting burst
which typically rises to
2.0A.
VDD_EXT
9
PO
Provide 1.8V for
external circuit
Vnorm=1.8V
IOmax=50mA
Power supply for
external GPIO’s pull up
circuits.
If unused, keep it
open.
VCORE
23
PO
Provide 1.2V for
external circuit
Vnorm=1.2V
Iomax=10mA
VCORE can be used
for the power indication
circuit.

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If unused, keep it
open.
GND
3, 5, 8,37,
39, 41, 52,
58~62,
64~67, 73
82~84,
89~97,
106
110~120
Ground
Turn On/Off
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
PON
7
DI
Turn on the module
High pulse.
Set this signal low
before and after the
startup impulse.
PWRKEY
79
DI
Turn on/off the
module
VILmax=0.5V
VBAT power domain.
RESET_N
34
DI
Reset the module
Active Low.
VILmax=0.5V
If unused, keep it
open.
Status Indication
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
STATUS
53
DO
Indicate the
module’s operation
status
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
USB Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USB_VBUS
47
AI
USB connection
detection
Vmax=5.25V
Vmin=3.0V
Vnorm=5.0V
Typical: 5.0V
If unused, keep it
open.
USB_DP
48
IO
USB differential data
bus (+)
USB 2.0 compliant;
90Ω differential
impedance;
If unused, keep it
open.
USB_DM
49
IO
USB differential data
bus (-)
USB 2.0 compliant;
90Ω differential
impedance.
If unused, keep it

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open.
(U)SIM Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
USIM_VDD
21
PO
Power supply for
(U)SIM card
Iomax=50mA
For 1.8V (U)SIM:
Vmax=1.9V
Vmin=1.7V
For 3.0V (U)SIM:
Vmax=3.05V
Vmin=2.7V
Either 1.8V or 3.0V
(U)SIM card is
supported and can
be identified
automatically by the
module.
USIM_DATA
18
IO
(U)SIM card data
For 1.8V (U)SIM:
VILmax=0.6V
VIHmin=1.2V
VOLmax=0.45V
VOHmin=1.35V
For 3.0V (U)SIM:
VILmax=1.0V
VIHmin=1.95V
VOLmax=0.45V
VOHmin=2.55V
USIM_CLK
22
DO
(U)SIM card clock
For 1.8V (U)SIM:
VOLmax=0.45V
VOHmin=1.35V
For 3.0V (U)SIM:
VOLmax=0.45V
VOHmin=2.55V
USIM_RST
16
DO
(U)SIM card reset
For 1.8V (U)SIM:
VOLmax=0.45V
VOHmin=1.35V
For 3.0V (U)SIM:
VOLmax=0.45V
VOHmin=2.55V
USIM_DET
17
DI
(U)SIM card hot-
plug detect
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.

UMTS/HSPA+ Module Series
UG89 Hardware Design
UG89_Hardware_Design 19 / 73
UART1 Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
UART1_RI
13
DO
Ring indicator
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
UART1_DCD
45
DO
Data carrier
detection
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
UART1_CTS
11
DO
Clear to send from
DTE
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
UART1_RTS
14
DI
Request to send
from DTE
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
UART1_DTR
46
DI
Data terminal ready.
Sleep mode control.
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
UART1_TXD
10
DO
Transmit data
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
UART1_RXD
12
DI
Receive data
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
UART1_DSR
44
DO
Data set ready
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
Debug UART Interface
Pin Name
Pin No.
I/O
Description
DC Characteristics
Comment
DBG_RXD
30
DI
Debug receive data
VILmin=-0.3V
VILmax=0.6V
VIHmin=1.2V
VIHmax=2.0V
1.8V power domain.
If unused, keep it
open.
DBG_TXD
31
DO
Debug transmit data
VOLmax=0.45V
VOHmin=1.35V
1.8V power domain.
If unused, keep it
open.
DBG_RTS
32
DI
Debug request to
send
VILmin=-0.3V
VILmax=0.6V
1.8V power domain.
If unused, keep it