Neoway N27 Installation manual

Hardware User Guide
Issue 2.0 Date 2021-10-15

N27 Hardware User Guide
Copyright
Copyright © Neoway Technology Co., Ltd. All rights reserved.
ii
Copyright © Neoway Technology Co., Ltd 2021. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior written
consent of Neoway Technology Co., Ltd.
is the trademark of Neoway Technology Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
This document provides a guide for users to use N27.
This document is intended for system engineers (SEs), development engineers, and test engineers.
THIS GUIDE PROVIDES INSTRUCTIONS FOR CUSTOMERS TO DESIGN THEIR APPLICATIONS.
PLEASE FOLLOW THE RULES AND PARAMETERS IN THIS GUIDE TO DESIGN AND COMMISSION.
NEOWAY WILL NOT TAKE ANY RESPONSIBILITY OF BODILY HURT OR ASSET LOSS CAUSED BY
IMPROPER OPERATIONS.
THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE DUE TO
PRODUCT VERSION UPDATE OR OTHER REASONS.
EVERY EFFORT HAS BEEN MADE IN PREPARATION OF THIS DOCUMENT TO ENSURE ACCURACY
OF THE CONTENTS, BUT ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS
DOCUMENT DO NOT CONSTITUTE A WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.
Neoway provides customers complete technical support. If you have any question, please contact your
account manager or email to the following email addresses:
[e-mail]
[e-mail]
Website: http://www.neoway.com

N27 Hardware User Guide
Contents
Copyright © Neoway Technology Co., Ltd. All rights reserved.
iii
Contents
1 Safety Recommendations ......................................................................10
2 About N27 .............................................................................................. 11
2.1 Product Overview........................................................................................................................11
2.2 Block Diagram.............................................................................................................................11
2.3 Basic Features ........................................................................................................................... 12
3 Module Pins ...........................................................................................15
3.1 Pad Layout................................................................................................................................. 15
3.2 Pin Description........................................................................................................................... 16
4 Application Interfaces.............................................................................22
4.1 Power Interface.......................................................................................................................... 22
4.1.1 VBAT.................................................................................................................................. 22
4.1.2 VDDIO_1P8....................................................................................................................... 24
4.2 Control Interfaces....................................................................................................................... 24
4.2.1 PWRKEY_N ...................................................................................................................... 24
4.3 Peripheral Interfaces.................................................................................................................. 26
4.3.1 USB ................................................................................................................................... 26
4.3.2 UART................................................................................................................................. 27
4.3.3 SIM .................................................................................................................................... 29
4.3.4 PCM................................................................................................................................... 31
4.3.5 SPI..................................................................................................................................... 35
4.3.6 I2C..................................................................................................................................... 36
4.4 RF Interface ............................................................................................................................... 37
4.4.1 ANT Interface..................................................................................................................... 37
4.4.2 ANT_GNSS Interface ........................................................................................................ 39
4.4.3 Antenna Assembling.......................................................................................................... 40
4.5 GPIO Interfaces ......................................................................................................................... 42
4.6 Other Interfaces ......................................................................................................................... 43
4.6.1 ADC ................................................................................................................................... 43
4.6.2 USB_BOOT....................................................................................................................... 43
4.6.3 STATUS............................................................................................................................. 43
4.6.4 NET_LIGHT....................................................................................................................... 44
5 Electric Features and Reliability .............................................................45
5.1 Electric Features ........................................................................................................................ 45
5.2 Temperature Features................................................................................................................ 46
5.3 ESD Protection........................................................................................................................... 46
6 RF Features...........................................................................................47
6.1 Operating Bands ........................................................................................................................ 47
6.2 TX Power and RX Sensitivity..................................................................................................... 48
6.3 GNSS Feature............................................................................................................................ 51

N27 Hardware User Guide
Contents
Copyright © Neoway Technology Co., Ltd. All rights reserved.
iv
7 Mechanical Features..............................................................................52
7.1 Dimensions................................................................................................................................. 52
7.2 Label........................................................................................................................................... 52
7.3 Packing....................................................................................................................................... 53
7.3.1 Packaging.......................................................................................................................... 53
7.3.2 Moisture............................................................................................................................. 54
8 Mounting N27 onto Application PCB.......................................................55
8.1 Bottom Dimensions.................................................................................................................... 55
8.2 Application Foot Print ................................................................................................................. 56
8.3 Stencil......................................................................................................................................... 56
8.4 Solder Paste............................................................................................................................... 56
8.5 SMT Furnace Temperature Curve.............................................................................................. 57
Abbreviations .........................................................................................59

N27 Hardware User Guide
Figures
Copyright © Neoway Technology Co., Ltd. All rights reserved.
v
Figures
Figure 2-1 Block diagram................................................................................................................. 12
Figure 3-1 N27 pin definition............................................................................................................ 15
Figure 4-1 Recommended power design......................................................................................... 23
Figure 4-2 Reference design of startup controlled by button........................................................... 24
Figure 4-3 Reference design of startup controlled by MCU............................................................. 25
Figure 4-4 Startup timing.................................................................................................................. 25
Figure 4-5 Shutdown timing............................................................................................................. 26
Figure 4-6 USB connection.............................................................................................................. 27
Figure 4-7 UART connection............................................................................................................ 28
Figure 4-8 Recommended level shifting network............................................................................. 29
Figure 4-9 Reference design of the SIM card interface................................................................... 30
Figure 4-10 PCM connection ........................................................................................................... 31
Figure 4-11 PCM sync signal timing................................................................................................. 32
Figure 4-12 PCM data input timing .................................................................................................. 32
Figure 4-13 PCM data output timing................................................................................................ 32
Figure 4-14 I2S connection.............................................................................................................. 34
Figure 4-15 I2S timing...................................................................................................................... 34
Figure 4-16 SPI connection.............................................................................................................. 35
Figure 4-17 SPI timing ..................................................................................................................... 36
Figure 4-18 Reference design of the I2C interface.......................................................................... 37
Figure 4-19 Pi network..................................................................................................................... 38
Figure 4-20 Recommended RF PCB design ................................................................................... 38
Figure 4-21 GNSS RF structure....................................................................................................... 39
Figure 4-22 Specifications of MM9329-2700RA1............................................................................ 40
Figure 4-23 RF connections............................................................................................................. 40
Figure 4-24 Antenna layout.............................................................................................................. 41
Figure 4-25 Layout around the antenna........................................................................................... 41

N27 Hardware User Guide
Figures
Copyright © Neoway Technology Co., Ltd. All rights reserved.
vi
Figure 4-26 Reference design of USB_BOOT................................................................................. 43
Figure 7-1 N27 dimensions (Unit: mm)............................................................................................ 52
Figure 8-1 Bottom dimensions of N27 (Unit: mm)............................................................................ 55
Figure 8-2 Recommended footprint of N27 application PCB (Unit: mm)......................................... 56
Figure 8-3 SMT furnace temperature curve..................................................................................... 57

N27 Hardware User Guide
Tables
Copyright © Neoway Technology Co., Ltd. All rights reserved.
vii
Tables
Table 2-1 Variant and frequency bands.............................................................................................11
Table 3-1 IO definition ...................................................................................................................... 16
Table 3-2 Pin description.................................................................................................................. 16
Table 4-1 Timing parameters of PCM interface................................................................................ 32
Table 4-2 Timing parameters of I2S interface.................................................................................. 34
Table 4-3 Timing parameters of SPI interface.................................................................................. 36
Table 5-1 Operating conditions of N27............................................................................................. 45
Table 5-2 Current consumption of N27 (typical)............................................................................... 45
Table 5-3 Temperature feature of N27 ............................................................................................. 46
Table 5-4 ESD protection of N27...................................................................................................... 46
Table 6-1 Operating Bands of N27................................................................................................... 47
Table 6-2 RF transmit power of N27 ................................................................................................ 48
Table 6-3 RX sensitivity of N27 GSM............................................................................................... 49
Table 6-4 RX sensitivity of N27 Cat M1 ........................................................................................... 49
Table 6-5 RX sensitivity of N27 Cat NB1 (without retransmission).................................................. 50
Table 6-6 RX sensitivity of N27 Cat NB1 (with retransmission)....................................................... 50

N27 Hardware User Guide
About This Document
Copyright © Neoway Technology Co., Ltd. All rights reserved.
viii
About This Document
Scope
This document is applicable to N27 series.
It defines the features, indicators, and test standards of the N27 module and provides reference for the
hardware design of each interface.
Audience
This document is intended for system engineers (SEs), development engineers, and test engineers.
Change History
Issue
Date
Change
Changed By
1.0
2019-12
Initial release.
Longsigh Huang
1.1
2020-04
Modified the variants.
Updated the currents.
Updated GNSS features.
Longsigh Huang
1.2
2020-09
Updated the variants and bands and deleted B14
from all variants.
Added B72 and B73 to N27-W1.
Deleted N27-W2.
Updated the temperature parameter.
Longsigh Huang
2.0
2021-10
Added the differences between the standard version
and the open version.
Dexter Zhang

N27 Hardware User Guide
About This Document
Copyright © Neoway Technology Co., Ltd. All rights reserved.
ix
Conventions
Symbol
Description
Indicates danger or warning. This information must be followed. Otherwise, a
catastrophic module or user device failure or bodily injury may occur.
Indicates caution. This symbol alerts the user to important points about using the
module. If these points are not followed, the module or user device may fail.
Indicates instructions or tips. This symbol provides advices or suggestions that
may be useful when using the module.
Related Documents
Neoway_N27_Datasheet
Neoway_N27_Product_Specifications
Neoway_N27_AT_Command_Mannual
Neoway_N27_EVK_User_Guide

N27 Hardware User Guide
Chapter 1 Safety Recommendations
Copyright © Neoway Technology Co., Ltd. All rights reserved.
10
1 Safety Recommendations
Ensure that this product is used in compliance with the requirements of the country and environment.
Read the following safety recommendations to avoid bodily injuries or damages of the product or
workplace:
Do not use this product at any places with a risk of fire or explosion.
If this product is used in a place with flammable gas or dust, such as propane gas, gasoline, and
flammable spray, it will cause an explosion or a fire.
Disable the wireless communication function in places where wireless communication is
prohibited.
Do not use this product that can interfere with other electronic devices in environments, such as
hospitals and airplanes.
Follow the requirements below during the application design and use of this product:
Do not disassemble this product without permission from Neoway. Otherwise, we are entitled to
refuse to provide further warranty.
Design your application correctly based on the hardware user guide. Connect this product to a
stable power supply and route traces following fire safety standards.
Avoid touching the pins of this product to prevent damages caused by ESD.
Do not insert or remove a SIM card or T-card if it is not powered off.

N27 Hardware User Guide
Chapter 2 About N27
Copyright © Neoway Technology Co., Ltd. All rights reserved.
11
2 About N27
N27 is an industrial-grade Cat M1/CAT NB1/CAT NB2 module that is developed on Qualcomm
MDM9205 and supports FDD LTE, GPRS, and GPS.
2.1 Product Overview
The N27 series includes multiple variants. The following table lists the variants and frequency bands
supported.
Table 2-1 Variant and frequency bands
Variant
Category
Band
GNSS
W3
Cat M1/
GPRS
Cat M1: B1, B2, B3, B4, B5, B8, B12, B13, B18, B19, B20,
B25, B26, B27, B28, B66, B85
GPRS: 850/900/1800/1900 MHz
Support
W1
Cat M1/Cat NB1/
Cat NB2
GPRS
Cat M1: B1, B2, B3, B4, B5, B8, B12, B13, B18, B19, B20,
B25, B26, B27, B28, B31, B66, B72,B73, B85
CATNB1/NB2: B1, B2, B3, B4, B5, B8, B12, B13, B18, B19,
B20, B25, B26, B28, B31, B66, B72,B73, B85
GPRS: 850/900/1800/1900 MHz
Support
WW
Cat M1/Cat NB1/
Cat NB2
GPRS
Cat M1: B1, B2, B3, B4, B5, B8, B12, B13, B18, B19, B20,
B25, B26, B27, B28, B66, B85
Cat NB1/NB2: B1, B2, B3, B4, B5, B8, B12, B13, B18, B19,
B20, B25, B26, B28, B66, B71, B85
GPRS: 850/900/1800/1900 MHz
Support
N27 adopts a 76-pin package with a square GND pad at each corner. Its dimensions are only 24.0 mm
×18.0 mm ×2.3 mm. With industrial-grade performance, it is well applicable to electrical terminals,
tracker, POS, and other IoT terminals.
2.2 Block Diagram
N27 consists of the following functionality units:
Baseband

N27 Hardware User Guide
Chapter 2 About N27
Copyright © Neoway Technology Co., Ltd. All rights reserved.
12
Internal memory
19.2MHz crystal oscillator
Power management unit
RF section
Digital interfaces (SIM, I2C, UART, PCM*, USB, LCD*, SPI)
Analog interfaces (ADC)
Figure 2-1 Block diagram
Power
Manager
Baseband+Internal memory
MDM9205
RF Front-end-
module
Interface
SIM
VBAT RF transceiver
SDR105
19.2MHz
I2C
SDI
O
SPI
UAR
T
USB GPI
OLCDUART SPI PCM
ADC
* indicates that the function is in the development phase.
2.3 Basic Features
Parameter
Description
Physical features
Dimensions: (24.0±0.15) mm ×(18.0±0.15) mm ×(2.3±0.2) mm
Package: LGA
Weight: 2.4g

N27 Hardware User Guide
Chapter 2 About N27
Copyright © Neoway Technology Co., Ltd. All rights reserved.
13
Temperature ranges
Operating: -40°C to +85°C 1
Storage: -40°C to +90°C
Operating voltage
VBAT: 3.1V to 4.3V, typical value: 3.6V
Current
PSM: < 4 μA
Idle: < 2 mA
Working: 250 mA@CAT M1
MIPS processor
ARM Cortex-A7 processor, 800 MHz main frequency, 256 KB L2 cache
Memory
32 MB LPDDR2 + 64MB NAND Flash
Band
See Table 2-1.
Wireless rate
GPRS: Max 85.6 Kbit/s(DL) / Max 85.6 Kbit/s(UL)
FDD LTE:
Cat M1, Max 588Kbps(DL)/Max 1.119Mbps(UL)
Cat NB1, Max 34Kbps(DL)/Max 19.7(single-tone)/66.6(multi-tone)Kbps(UL)
Cat NB2, Max 127Kbps(DL)/Max 158.5Kbps(UL)
Transmit power
EGSM900: +33dBm (Power Class 4)
DCS1800: +30dBm (Power Class 1)
LTE CAT-M/CAT-NB: +23dBm (Power Class 3)
Application
interfaces
2G/4G antenna, GNSS antenna, 50Ω characteristic impedance
Two UART interfaces, at most 4 Mbit/s
One SIM interface, 1.8V only
One USB2.0 interface, slave mode only
Two ADC interfaces, detectable voltage ranging from 0.1 V to 1.7V
(supported by the open version only)
One I2C interface, master mode only (supported by the open version only)
One SPI interface, maximum frequency of 50 MHz (supported by the open
version only)
One PCM interface, MUX as I2S interface
One GPIO interface
AT commands
3GPP Release 13
Neoway extended commands
SMS
PDU, TXT
Protocol
TCP, UDP, HTTP, FTP, MQTT, LWM2M, COAP
Certification approval
European Union: CE/RoHS/POPs
1
Some RF indicators might not meet 3GPP/3GPP2 standards in extended temperature but it does not affect
functioning.

N27 Hardware User Guide
Chapter 2 About N27
Copyright © Neoway Technology Co., Ltd. All rights reserved.
14
U.S.: FCC/PTCRB/AT&T
Japan: JATE
Australia: RCM
Europe: GCF
Deutsche Telekom

N27 Hardware User Guide
Chapter 3 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
15
3 Module Pins
There are 76 pins on N27 and their pads are introduced in the LGA package.
3.1 Pad Layout
Figure 3-1 shows the pad layout of the N27. The superscript 1indicates that the pin is defined to be
supported by the open version.
Figure 3-1 N27 pin definition
13
2
3
4
5
6
7
8
9
10
11
12
74
1
UART0_RXD/UART1_RXD1
UART0_TXD/UART1_TXD1
VDDIO_1P8
GND
GPIO_46
GPIO_40
GPIO_42
GPIO_31
GPIO_32
GPIO_33
GPIO_34
GPIO_35
GPIO_36
GND
VBAT
VBAT
GND
USIM_DET
USIM_VCC
USIM_DATA
USIM_CLK
USIM_RESET
GND
I2C2_SDA1
I2C2_SCL1
UART2_TXD
73
16
17
18
19
20
21
15
PCM_SYNC
PCM_DIN
PCM_DOUT
PCM_CLK
I2S_MCLK
ADC21
ADC41
14
UART2_RXD
22 23 24 25 26 27 28 29 30 32 31
UART2_RTS1
UART1_TXD/UART2_TXD1
GND
UART2_CTS1
UART1_RXD/UART2_RXD1
USB_VDD_3P3_EN
USB_VDD_3P3
USB_VBUS
USB_DM
USB_DP
GND
33 34 36 35
USB_BOOT
GPIO_51 GPIO_38
GPIO_37
45
56
55
54
53
52
51
50
49
48
47
46
75
57
76
42
41
40
39
38
37
43
44
UART1_CTS1
UART1_RTS1
PWRKEY_N
RESERVED
WAKEUP_IN
WAKEUP_OUT
STATUS
NET_LIGHT
72 71 70 69 68 67 66 65 64 62 63 61 60 58 59
ANT_GNSS 1PPS1
GND
GND GNSS_LNA_EN GND SPI4_MOSI1 SPI4_MISO1 SPI4_CLK1 SPI4_CS_N1 GPIO_47 GPIO_45 GND ANT
GND
N27
Top View
GND
GND
GND GND

N27 Hardware User Guide
Chapter 3 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
16
3.2 Pin Description
Table 3-1 lists the definition of IO types
Table 3-1 IO definition
IO Type
B
Digital input/output, COMS logic level
DO
Digital output, COMS logic level
DI
Digital input, COMS logic level
PO
Power output
PI
Power input
AO
Analog output
AI
Analog input
AIO
Analog input/output
Level Feature
P3
1.8V digital IO power domain
VIH min=1.2V, VIL max= 0.3V
VOH min=1.35V, VOLmax=0.45V
P4
3.3V power supply of USB_PHY core
Vtyp=3.3V
Table 3-2 Pin description
Signal
Pin
I/O
Function
Level Feature
Remarks
Power Interface
VBAT
2, 3
PI
Main power
input
Vmin=3.1V,
Vmax=4.3V,
Vtyp=3.6V
Peak current is up to 3A
VDDIO_1P8
47
PO
1.8V power
output
Vnorm=1.8V
Imax=50 mA
Used only for level shifting and
IO power supply.
Leave this pin floating if it is not
used.
GND
1, 4, 10, 22, 32, 46, 58, 60, 67, 70, 72, 73, 74,
75, 76
Ensure that all GND pins are
connected to the ground plane
Control Interfaces
PWRKEY_N
52
DI
ON/OFF
button
P3
Connected to 1.8V through an
internal pull-up resistor

N27 Hardware User Guide
Chapter 3 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
17
Used to control the module
startup, shutdown, and
wakeup from PSM.
STATUS
56
DO
Startup
indicator
P3
Used to indicate the startup
status of the module
Leave this pin floating if it is not
used.
NET_LIGHT
57
DO
Network
status
indicator
P3
Leave this pin floating if it is not
used.
WAKEUP_OUT
55
DO
Wake up the
device
P3
Wake-up pin. Leave this pin
floating if it is not used.
UART0 Interface
UART0_TXD/UA
RT1_TXD1
48
DO
Data TX
P3
Software (standard) version:
used as UART0_TXD and
used for data transmission.
Leave this pin floating if it is not
used.
Software (open) version: used
as UART1_TXD and used for
data transmission and log
printing. Leave this pin floating
if it is not used.
UART0_RXD/UA
RT1_RXD1
49
DI
Data RX
P3
Software (standard) version:
used as UART0_RXD and
used for data transmission.
Leave this pin floating if it is not
used.
Software (open) version: used
as UART1_RXD and used for
data transmission and log
printing. Leave this pin floating
if it is not used.
UART1_CTS1
50
DI
Clear to send
P3
Software (open) version: used
as UART1_CTS and used for
data transmission and log
printing. Leave this pin floating
if it is not used.
UART1_RTS1
51
DO
Request to
send
P3
Software (open) version: used
as UART1_RTS and used for
data transmission and log
printing. Leave this pin floating

N27 Hardware User Guide
Chapter 3 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
18
if it is not used.
UART1 Interface
UART2_RTS1
23
DO
Request to
send
P3
Software (open) version: used
as UART2_RTS and used for
data transmission and AT
commands. Leave this pin
floating if it is not used.
UART2_CTS1
24
DI
Clear to send
P3
Software (open) version: used
as UART2_CTS and used for
data transmission and AT
commands. Leave this pin
floating if it is not used.
UART1_RXD/UA
RT2_RXD1
25
DI
Data RX
P3
Software (standard) version:
used as UART1_RXD and
used for data transmission.
Leave this pin floating if it is not
used.
Software (open) version: used
as UART2_RXD and used for
data transmission and AT
commands. Leave this pin
floating if it is not used.
UART1_TXD/UA
RT2_TXD1
26
DO
Data TX
P3
Software (standard) version:
used as UART1_TXD and
used for data transmission.
Leave this pin floating if it is not
used.
Software (open) version: used
as UART2_TXD and used for
data transmission and AT
commands. Leave this pin
floating if it is not used.
UART2 Interface
UART2_TXD2
13
DO
Data TX
P3
Software (open) version: The
pinscannotbe used.Leavethe
pins floating.
UART2_RXD
14
DI
Data RX
P3
SIM Interface
USIM_VCC
6
PO
SIM card
power supply
output
Support 1.8V only, IOmax
=30mA
USIM_DATA
7
B
SIM card
data IO
P3
Connect it to USIM_VCC
through a 10 kΩ pull-up

N27 Hardware User Guide
Chapter 3 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
19
resistor.
USIM_CLK
8
DO
SIM card
clock
P3
USIM_RESET
9
DO
SIM card
reset
P3
USIM_DET
5
DI
SIM detect
P3
USB Interface
USB_VBUS
29
PI
Charging
voltage
check
4.75V~5.25V
Typical value:
5.0V
The interface complies with the
USB2.0 standard.
USB_DM
30
AIO
USB data
negative
signal
USB_DP
31
AIO
USB data
positive
signal
USB_VDD_3P3
28
PO
Power supply
for the
USB_PHY
P4
Do not use it.
Leave this pin floating.
USB_VDD_3P3_
EN
27
B
P3
Reserved
Leave this pin floating.
ADC Interface
ADC21
20
AI
Analog-to-
digital signal
conversion
Vmax=1.7V;
Vmin=0.1V
Software (open) version: used
as ADC4. 15-bit, detectable
voltage ranging from 0.1V to
1.7V.
Leave this pin floating if it is not
used.
ADC41
21
AI
Analog-to-
digital signal
conversion
Vmax=1.7V;
Vmin=0.1V
Software (open) version: used
as ADC2. 15-bit, detectable
voltage ranging from 0.1V to
1.7V.
Leave this pin floating if it is not
used.
I2C Interface
I2C2_SCL1
12
B
I2C clock
P3
Software (open) version: used
as I2C2_SCL. Connect it to
1.8V by using an external 2.2
kΩ pull-up resistor. Leave this
pin floating if it is not used.

N27 Hardware User Guide
Chapter 3 Module Pins
Copyright © Neoway Technology Co., Ltd. All rights reserved.
20
I2C2_SDA1
11
B
I2C data
P3
Software (open) version: used
as I2C2_SDA. Connect it to
1.8V by using an external 2.2
kΩ pull-up resistor. Leave this
pin floating if it is not used.
PCM Interface
PCM_SYNC
15
B
PCM
synchronous
signal
P3
Software (open) version: Do
not use this pin. Leave this pin
floating.
PCM_DIN
16
DI
PCM data RX
P3
Software (open) version: Do
not use this pin. Leave this pin
floating.
PCM_DOUT
17
DO
PCM data TX
P3
Software (open) version: Do
not use this pin. Leave this pin
floating.
PCM_CLK
18
DO
PCM clock
signal
P3
Software (open) version: Do
not use this pin. Leave this pin
floating.
I2S_MCLK
19
DO
I2S main
clock
P3
Software (open) version: Do
not use this pin. Leave this pin
floating.
SPI Interface
SPI4_CLK1
64
DO
Clock signal
P3
Software (open) version: used
as SPI4_CLK.
SPI4_MISO1
65
DI
Slave output,
master input
P3
Software (open) version: used
as SPI4_MISO.
SPI4_MOSI1
66
DO
Slave input,
master
output
P3
Software (open) version: used
as SPI4_MOSI.
SPI4_CS_N1
63
DO
Chip select
P3
Software (open) version: used
as SPI4_CS_0.
GPIO
GPIO_31
42
B
P3
GPIO_322
41
B
P3
GPIO_33
40
B
P3
GPIO_34
39
B
P3
GPIO_35
38
B
P3
GPIO_36
37
B
With interrupt
P3