YUGE LCC Series User manual

Product name
CLM920_RC3(RV3 RE3)LCC Series CAT1 Module
Hardware Manual
Pages
69
Version
V1.1
Date
2020/5/6
CLM920_RC3(RV3 RE3)
LCC Series CAT1 Module
Hardware Manual
V1.1
Shanghai YUGE Information Technology co., LTD
All rights reserved

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
- 2 -
History
Version
Date
Description
Author
V1.0
20200406
Initial
David
V1.1
20200506
1.Modify power consumption data
2.Modify some function pin descriptions
3.Add Wifi scan function description
David

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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Contents
Chapter 1. introduction...........................................................................................................- 8 -
Chapter2. Module overview................................................................................................... - 9 -
2.1 Module Introduction..................................................................................................... - 9 -
2.2 Module characteristics.................................................................................................. - 9 -
2.3 Module function..........................................................................................................- 12 -
Chapter 3. Interface application description.........................................................................- 14 -
3.1 Overview of this chapter............................................................................................. - 14 -
3.2 Module interface......................................................................................................... - 15 -
3.2.1 Module pinout...................................................................................................... - 15 -
3.2.2 Pin definition........................................................................................................ - 16 -
3.3 Power interface........................................................................................................... - 23 -
3.3.1 Power supply design.............................................................................................- 23 -
3.3.2 Power reference circuit.........................................................................................- 25 -
3.3.3 VDD_EXT Voltage output................................................................................... - 26 -
3.4 Switch machine reset.................................................................................................. - 26 -
3.4.1 Module boot......................................................................................................... - 26 -
3.4.2 Boot sequence.......................................................................................................- 27 -
3.4.3 Module shutdown................................................................................................. - 28 -
3.4.4 Reset control.........................................................................................................- 29 -
3.5 USB interface..............................................................................................................- 31 -
3.6 UART interface........................................................................................................... - 32 -
3.6.1 Main UART.......................................................................................................... - 32 -
3.6.2 Debug UART port................................................................................................ - 34 -
3.6.3 RI Signal interface................................................................................................- 34 -
3.7 USIM interface............................................................................................................- 35 -
3.7.1 USIM card reference circuit................................................................................. - 35 -
3.7.2 USIM_ PRESENCE Hot Swap Reference Design...............................................- 36 -
3.8 General GPIO interface...............................................................................................- 37 -
3.9 Status indication interface...........................................................................................- 38 -
3.10 PCM Digital voice interface..................................................................................... - 39 -
3.11 I2C bus...................................................................................................................... - 41 -
3.12 SDIO interface.......................................................................................................... - 41 -

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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3.13 ADC interface........................................................................................................... - 43 -
3.14 WiFi SCAN...............................................................................................................- 43 -
3.15 RF interface...............................................................................................................- 43 -
3.15.1 Antenna matching circuit....................................................................................- 44 -
3.15.2 RF trace reference...............................................................................................- 45 -
Chapter 4. Overall technical indicators................................................................................ - 47 -
4.1 Overview of this chapter............................................................................................. - 47 -
4.2 working frequency...................................................................................................... - 47 -
4.3 Conducted RF measurement....................................................................................... - 48 -
4.3.1 Test environment.................................................................................................. - 48 -
4.3.2 Standard test......................................................................................................... - 48 -
4.4 Conducted receive sensitivity and transmit power..................................................... - 48 -
4.5 Antenna requirements................................................................................................. - 50 -
4.6 Power consumption characteristics.............................................................................- 51 -
Chapter 5. Interface electrical characteristics.......................................................................- 55 -
5.1 Overview of this chapter............................................................................................. - 55 -
5.2 Working storage temperature...................................................................................... - 55 -
5.3 Module IO level.......................................................................................................... - 55 -
5.4 Power characteristics.................................................................................................. - 55 -
5.5 Static characteristics....................................................................................................- 56 -
5.6 Reliability index..........................................................................................................- 56 -
Chapter 6. Structure and mechanical properties...................................................................- 59 -
6.1 Overview of this chapter............................................................................................. - 59 -
6.2 Exterior....................................................................................................................... - 59 -
6.3 Mechanical Dimensions..............................................................................................- 60 -
Chapter7. Packaging and production....................................................................................- 63 -
7.1 Overview of this chapter............................................................................................. - 63 -
7.2 Module packaging and storage................................................................................... - 63 -
7.3 Production welding..................................................................................................... - 63 -
Chapter 8. Appendix.............................................................................................................- 65 -
8.1 Overview of this chapter............................................................................................. - 65 -
8.2 Acronyms.................................................................................................................... - 65 -
8.3 Encoding..................................................................................................................... - 66 -
8.4 Use safety and precautions..........................................................................................- 69 -

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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Picture index
Figure 2-1 CLM920_RC3 LCC module functional block diagram..................................... - 13 -
Figure 3-1 CLM920_RC3 module pin layout (TOP perspective)........................................ - 15 -
Figure 3-2 Power supply design...........................................................................................- 24 -
Figure 3-3 GSM Burst transmit power drop limit................................................................- 25 -
Figure 3-4 LDO linear power reference circuit....................................................................- 25 -
Figure 3-5 DC switching power supply reference circuit.................................................... - 25 -
Figure 3-6 PMOS tube control power switch reference circuit............................................- 26 -
Figure 3-7 Power-on sequence diagram............................................................................... - 27 -
Figure 3-8 Open-collection drive start-up reference circuit................................................. - 28 -
Figure 3-9 Reference circuit for key start.............................................................................- 28 -
Figure 3-10 Shutdown timing diagram.................................................................................- 29 -
Figure 3-11 Reset reference circuit...................................................................................... - 30 -
Figure 3-12 Reset timing diagram........................................................................................- 30 -
Figure 3-13 USB connection design circuit diagram........................................................... - 31 -
Figure 3-14 Full-featured UART port design....................................................................... - 33 -
Figure 3-15 Four-wire serial port design..............................................................................- 33 -
Figure 3-16 Level conversion chip circuit............................................................................- 34 -
Figure 3-17 RI pin signal waveform.................................................................................... - 35 -
Figure 3-18 USIM design circuit diagram............................................................................- 35 -
Figure 3-19 USIM card hot swap detection......................................................................... - 37 -
Figure 3-20 Network indicator circuit diagram....................................................................- 39 -
Figure 3-21 PCM short frame mode timing diagram........................................................... - 40 -
Figure 3-22 PCM to analog voice map.................................................................................- 40 -
Figure 3-23 I2C interface reference circuit diagram............................................................ - 41 -
Figure 3-24 SD card interface reference circuit diagram..................................................... - 42 -
Figure 3-25 Antenna matching circuit..................................................................................- 44 -
Figure 3-26 The complete structure of the microstrip line...................................................- 45 -
Figure 3-25 The complete structure of the strip line............................................................ - 46 -
Figure 3-27 The reference ground is the structure of the third layer PCB microstrip
transmission line...................................................................................................................- 46 -
Figure 6-1 CLM920_RC3 appearance................................................................................. - 59 -
Figure 6-2 Front and side views of the module (unit: mm)..................................................- 60 -

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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Figure 6-3 Bottom view of the module (unit: mm).............................................................. - 61 -
Figure 6-4 Recommended package of the module (unit: mm).............................................- 62 -
Figure 7-1 Reflow soldering temperature curve...................................................................- 64 -
Table index
Table 2-1 Module series description.......................................................................................- 9 -
Table 2-2 Key features..........................................................................................................- 10 -
Table 3-1 Pin definition........................................................................................................ - 16 -
Table 3-2 IO parameter definition........................................................................................ - 18 -
Table 3-3 Pin description......................................................................................................- 18 -
Table 3-4 Definition of power pins...................................................................................... - 23 -
Table 3-5 Power supply design description..........................................................................- 24 -
Table 3-6 Pin definition of switch........................................................................................ - 27 -
Table 3-7 Power-on sequence parameters............................................................................ - 27 -
Table 3-8 Module shutdown methods.................................................................................. - 28 -
Table 3-9 Reset pin definition.............................................................................................. - 29 -
Table 3-10 Reset method...................................................................................................... - 29 -
Table 3-11 RESET pin parameters....................................................................................... - 30 -
Table 3-12 USB interface pin definition.............................................................................. - 31 -
Table 3-13 Definition of main UART port signals............................................................... - 32 -
Table 3-14 Debug serial port pin definition......................................................................... - 34 -
Table 3-15 SIM card signal definition..................................................................................- 35 -
Table 3-16 Definition of SIM card hot swap detection pins................................................ - 36 -
Table 3-17 General GPIO pin definition.............................................................................. - 37 -
Table 3-18 Definition of status indication pins.................................................................... - 38 -
Table 3-19 Network registration status indication................................................................- 38 -
Table 3-20 Module status indication.................................................................................... - 38 -
Table 3-21 Module network operating status indication...................................................... - 38 -
Table 3-21 PCM pin definition.............................................................................................- 39 -
Table 3-22 PCM specific parameters................................................................................... - 39 -
Table 3-23 I2C pin definition............................................................................................... - 41 -
Table 3-24 SD card pin definition........................................................................................ - 41 -
Table 3-25 Definition of ADC pins...................................................................................... - 43 -
Table 3-26 Antenna interface pin definition.........................................................................- 43 -

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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Table 4-1 4G and 2G frequency table...................................................................................- 47 -
Table 4-2 GNSS frequency table..........................................................................................- 47 -
Table 4-3 Test instruments....................................................................................................- 48 -
Table 4-4 2G RF indicators.................................................................................................. - 48 -
Table 4-5 4G RF sensitivity index........................................................................................- 48 -
Table 4-6 4G RF transmit power index................................................................................ - 49 -
Table 4-7 GNSS performance parameters............................................................................ - 49 -
Table 4-8 Antenna specifications..........................................................................................- 50 -
Table 4-9 GNSS antenna specifications............................................................................... - 50 -
Table 4-10 Average shutdown power consumption..............................................................- 51 -
Table 4-11 Instrument sleep and idle power consumption (GNSS off)................................- 51 -
Table 4-12 Real network sleep and idle power consumption of the three major operators
(GNSS off)............................................................................................................................- 51 -
Table 4-13 GSM call power consumption............................................................................- 52 -
Table 4-14 GPRS average power consumption....................................................................- 52 -
Table 4-15 LTE data transmission power consumption....................................................... - 53 -
Table 5-1 CLM920_RC3 module working storage temperature..........................................- 55 -
Table 5-2 Electrical characteristics of CLM920_RC3 module............................................ - 55 -
Table 5-3 Working voltage of CLM920_RC3 module......................................................... - 55 -
Table 5-4 CLM920_RC3 ESD characteristics..................................................................... - 56 -
Table 5-5 CLM920_RC3 reliability test...............................................................................- 56 -
Table 7-1 Reflow process parameter table........................................................................... - 64 -
Table 8-1 Abbreviations....................................................................................................... - 65 -
Table 8-2 GPRS / EDGE time slot allocation table for different levels............................... - 66 -
Table 8-3 GPRS maximum rate............................................................................................- 67 -
Table 8-4 EDGE maximum rate........................................................................................... - 67 -
Table 8-5 LTE-FDD DL maximum rate............................................................................... - 67 -
Table 8-6 LTE-FDD UL maximum rate............................................................................... - 68 -

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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Chapter 1. introduction
This document is a wireless solution product CLM920_RC3 (RV3 RE3) LCC package CAT1
module hardware interface manual, which is designed to describe the hardware composition
and functional characteristics of the module solution product, application interface definition
and instructions, electrical performance and mechanical characteristics. Combined with this
document and other application documents, users can quickly use this module to design
wireless application solutions.

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
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Chapter2. Module overview
2.1 Module Introduction
Yuge LCC encapsulates CAT1 series modules, including CLM920_RC3, CLM920_RV3 and
CLM920_RE3 The interfaces of the three modules are identical, and only the supported
frequency bands are different. For details, please refer to Table 2-1. The following interface
description uses CLM920_RC3 as an example.
The CLM920_RC3 module is a wireless communication module that integrates multiple
network formats such as FDD-LTE / TDD-LTE / GSM / GPRS / EDGE and supports 3GPP
R9 CAT1.
The module is developed based on ASR1601 platform of ASR company, built-in multiple
network protocols (PAP, PPP, CHAP, TCP, UDP, etc.), support VoLTE function, support
SRVCC, support CSFB to GSM, support GPS positioning function. Supports embedded
operating systems such as Windows / Linux / Android.
CLM920_RC3 module can be used in the following occasions：
Car Equipment
Wireless POS machine
Wireless advertising, multimedia
Remote monitoring
Smart meter reading
Wearable device
security system
Other wireless terminals, etc.
2.2 Module characteristics
Table 2-1 Module series description
Network
Type
Frequency band
Module series
CLM920_RC3
CLM920_RV3
CLM920_RE3
GSM
GSM850

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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1.CLM920_RC3（RV3 RE3）Module does not support diversity。
2.GNSS function【1】is optional.
Table 2-2 Key features
Characteristic
Description
Physical characteristics
32mm x 29mm x 2.4mm
Fixed way
LCC package, fixed patch
Operating Voltage
3.3V-4.2V Typical voltage 3.7V
Power saving current
Sleep current <3mA
USIM
interface
Support 3.0V / 1.8V, support hot swap detection function
USB interface
Compliant with USB2.0 specification (only supports slave
mode), the data transfer rate is up to 480Mbps
GSM900
GSM1800
LTE(FDD)
LTE FDD B1
LTE FDD B3
LTE FDD B5
LTE FDD B7
LTE FDD B8
LTE FDD B20
LTE(TDD)
LTE TDD B34
LTE TDD B38
LTE TDD B39
LTE TDD B40
LTE TDD B41
GNSS【1】
GLONASS
GPS
BeiDou
Galileo

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Applicati
on
interface
Used for AT commands, data transmission, software
debugging and software upgrade
USB driver: support Windows / Linux / Android etc.
UART
interface
Main serial port (4-wire):
Support RTS and CTS hardware flow control
Used for AT commands and data transmission
Baud rate up to 3.6Mbps, the default is 115200bps
Debug serial port (2 lines):
Used for debugging information output and printing
module log
The default baud rate is 115200bps
PCM
interface
PCM digital audio, external codec chip
Only main mode is supported
SDIO
interface
Compliant with SDIO 3.0 protocol
Compliant with IEEE 802.11 standard
I2C interface
Compliant with I2C bus protocol
High speed mode can support up to 3.4Mbps rate
ADC
interface
Supports two 12-bit sampling ADCs
Voltage input range 0 ~ 1.2V
Status
indicator
NET_STATUS network operation status indication
NET_MODE network registration status indication
STATUS module running status indication
General GPIO
WAKEUP_IN sleep mode control
W_DISABLE # Flight mode control
Two general-purpose input and output ports GPIO69,
GPIO74
Frequency band
LTE-TDD:B34/B38/B39/B40/B41
LTE-FDD:B1/B3/B5/B8
GSM/GPRS/EDGE:GSM900/DCS1800
Transmit power
LTE: Class 3(23dBm±2dB)
Class 4(33dBm±2dB) GSM900
Class 1(30dBm±2dB) DCS1800
Data service
GPRS/EDGE(3GPP R99):

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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GPRS: DL 85.6kbps/UL 85.6kbps
EDGE: DL 236.8kbps/UL 236.8kbps
LTE ( CAT1) DL 10Mbps,UL 5Mbps@20M
Satellite positioning
GPS/BeiDou/GLONASS/Galileo
Protocol：NMEA
AT command
Support standard AT instruction set (Hayes 3GPP TS
27.007 and 27.005)
For details, please check the AT commands
Network protocol
SupportTCP/UDP/PPP/HTTP/NITZ/CMUX/NDIS/NTP/
HTTPS/PING protocol
Antenna interface
MAIN×1，GNSS×1
Characteristic impedance 50 ohm
Virtual network card
Support USB virtual network card
Temperature range
Normal working temperature -30℃to + 75℃
Limit working temperature -40℃to + 85℃
Storage temperature
-40℃to + 85℃
Humidity
RH5%～RH95%
Module function
distinction
On the label paper, W stands for WiFi positioning, G
stands for GNSS
When the temperature exceeds the range of –30℃～+ 75℃, some RF specifications of
CLM920_RC3 module may exceed the requirements of 3GPP specifications.
2.3 Module function
CLM920_RC3 LCC module mainly includes the following circuit units：
Baseband RF processing unit
Power management unit
Memory cell
Module interface unit.
The functional block diagram of the CLM920_RC3 LCC module is shown below：

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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Figure 2-1 CLM920_RC3 LCC module functional block diagram

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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Chapter 3. Interface application description
3.1 Overview of this chapter
This chapter mainly describes the interface definition and application of this module.
Contains the following parts：
144 pin pin layout
Interface definition
Power interface
USB interface
USIM interface
UART interface
ADC interface
Status indication interface
PCM digital voice interface
GPIO interface
SDIO interface
WiFi SCAN
RF antenna interface.

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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3.2 Module interface
3.2.1 Module pinout
Figure 3-1 CLM920_RC3 module pin layout (TOP perspective)
The modules Pin85 ~ Pin112 are heat dissipation pads, and it is recommended to be
grounded during design.
All RESERVED and unused Pin feet need to be left open.

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3.2.2 Pin definition
The CLM920_RC3 module is an LCC interface module. Its pin definitions are shown in the
table below：
Table 3-1 Pin definition
Pin
Pin name
Pin
Pin name
1
WAKEUP_IN
2
GPIO74
3
GPIO69
4
W_DISABLE#
5
NET_MODE
6
NET_STATUS
7
VDD_EXT
8
GND
9
GND
10
GND
11
DBG_RXD
12
DBG_TXD
13
SIM_PRESENCE
14
USIM_VDD
15
USIM_DATA
16
USIM_CLK
17
USIM_RST
18
RESERVED
19
GND
20
RESET_N
21
PWRKEY
22
GND
23
SD_DET
24
PCM_IN
25
PCM_OUT
26
PCM_SYNC
27
PCM_CLK
28
SDC_DATA3
29
SDC_DATA2
30
SDC_DATA1
31
SDC_DATA0
32
SDC_CLK
33
SDC_CMD
34
VDD_SD
35
RESERVED
36
GND
37
SPI_CS
38
SPI_MOSI
39
SPI_MISO
40
SPI_CLK
41
I2C_SCL
42
I2C_SDA
43
RESERVED
44
GPADC1
45
GPADC0
46
GND
47
ANT_GNSS
48
GND
49
ANT_MAIN
50
GND

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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51
GND
52
GND
53
GND
54
GND
55
RESERVED
56
GND
57
VBAT_RF
58
VBAT_RF
59
VBAT_BB
60
VBAT_BB
61
STATUS
62
RI
63
DCD
64
CTS
65
RTS
66
DTR
67
TXD
68
RXD
69
USB_DP
70
USB_DM
71
USB_VBUS
72
GND
73
RESERVED
74
RESERVED
75
RESERVED
76
RESERVED
77
RESERVED
78
RESERVED
79
RESERVED
80
RESERVED
81
RESERVED
82
RESERVED
83
RESERVED
84
RESERVED
85
GND
86
GND
87
GND
88
GND
89
GND
90
GND
91
GND
92
GND
93
GND
94
GND
95
GND
96
GND
97
GND
98
GND
99
GND
100
GND
101
GND
102
GND
103
GND
104
GND
105
GND
106
GND
107
GND
108
GND
109
GND
110
GND
111
GND
112
GND
113
RESERVED
114
RESERVED

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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Table 3-2 IO parameter definition
Table 3-3 Pin description
Power supply
Pin
Definition
IO
Functional description
Remarks
7
VDD_EXT
PO
1.8V voltage output
Can provide
pull-up for external
115
USB_BOOT
116
RESERVED
117
RESERVED
118
RESERVED
119
RESERVED
120
RESERVED
121
RESERVED
122
RESERVED
123
RESERVED
124
RESERVED
125
RESERVED
126
RESERVED
127
RESERVED
128
RESERVED
129
RESERVED
130
RESERVED
131
RESERVED
132
RESERVED
133
RESERVED
134
RESERVED
135
RESERVED
136
RESERVED
137
RESERVED
138
RESERVED
139
RESERVED
140
RESERVED
141
RESERVED
142
RESERVED
143
RESERVED
144
RESERVED
Symbol sign
Description
IO
Bidirectional input and output
PI
Power input
PO
Power Output
AI
Analog input
AO
Analog output
DI
Digital input
DO
Digital output
OD
Open drain

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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GPIO (maximum
50mA), please
leave it open when
not in use
57
VBAT_RF
PI
Module RF power input
The power supply
needs to provide at
least 2A current
58
VBAT_RF
PI
Module RF power input
59
VBAT_BB
PI
Module baseband power input
60
VBAT_BB
PI
Module baseband power input
8~10,19,22,
36,46,48,50
~54,56,72
GND
Ground
85~112
GND
Thermal pad
GPIO pin
Pin
Definition
IO
Functional description
Remarks
1
WAKEUP_IN
DI
External device wake-up module
1.8V voltage domain
2
GPIO74
IO
General GPIO
1.8V voltage domain
3
GPIO69
IO
General GPIO
1.8V voltage domain
4
W_DISABLE#
DI
Flight mode control
Function is being
developed
Module status indication interface
Pin
Definition
IO
Functional description
Remarks
5
NET_MODE
DO
Module 4G network status
indication
1.8V, left floating
when not in use
6
NET_STATUS
DO
Module network status
indication
61
STATUS
DO
Module operating status
indication
1.8V, left floating
when not in use
Debug UART
Pin
Definition
IO
Functional description
Remarks
11
DBG_RXD
DI
Debug serial data
reception
1.8V, left floating
when not in use
12
DBG_TXD
DO
Debug serial data
1.8V, left floating

CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
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transmission
when not in use
USIM interface
Pin
Definition
IO
Functional description
Remarks
13
SIM_PRESENCE
DI
USIM card hot swap detection
Internal 10K
resistor pull-up
14
USIM_VDD
PO
USIM card power supply
1.8V or 3V
15
USIM_DATA
IO
USIM card data signal cable
16
USIM_CLK
DO
USIM card clock signal line
17
USIM_RST
DO
USIM card reset signal cable
Module power on and off
Pin
Definition
IO
Functional description
Remarks
20
RESET_N
DI
Module reset signal, internal
10K pull-up
1.8V voltage domain
21
PWRKEY
DI
Switch signal
Default low level
boot
PCM interface
Pin
Definition
IO
Functional description
Remarks
24
PCM_IN
DI
PCM receive data
1.8V voltage domain
25
PCM_OUT
DO
PCM send data
1.8V voltage domain
26
PCM_SYNC
IO
PCM frame synchronization
signal
1.8V voltage domain
27
PCM_CLK
IO
PCM clock pulse
1.8V voltage domain
SDIO interface
Pin
Definition
IO
Functional description
Remarks
23
SD_DET
DI
SD card detection
28
SDC_DATA3
DI
SD card SDIO bus DATA3
1.8V / 2.8V voltage
domain
29
SDC_DATA2
IO
SD card SDIO bus DATA2
1.8V / 2.8V voltage
domain
30
SDC_DATA1
IO
SD card SDIO bus DATA1
1.8V / 2.8V voltage
domain
31
SDC_DATA0
IO
SD card SDIO bus DATA0
1.8V / 2.8V voltage