Pi 2 Design CM4AES Hardware Reference Manual – P0.1
PAGE 17
9.2
P1 – EXPANSION I/O CONNECTOR
P1 is an Amphenol HLW20S-2C7LF 20-Pin 1MM Pitch Flex connector. The Pinout for
P1 is shown in the following table.
P1 PIN
Name
Description
1
MCLK
Buffered I2S Master Clock
2
GND
Ground
3
BCLK
Buffered I2S Bit Clock
4
GND
Ground
5
LRCLK
Buffered I2S Left/Right (Word) Clock
6
GND
Ground
7
SDO
Buffered I2S Data
8
GND
Ground
9
RSVD
Connected to CM4 GPIO20
10
*PSW
Power Enable – Low True
11
RSVD
Connected to CM4 GPIO27
12
*RST
Reset from CM4
13
RSVD
Connected to CM4 GPIO4
14
RSVD
Connected to CM4 GPIO5
15
GND
Ground
16
SCL
I2C Clock
17
SDA
I2C Data
18
*ALED
Connected to CM4 Activity LED Signal
19
*PLED
Connected to CM4 Power LED Signal
20
GND
Ground
Table 6 – Expansion I/O Connector Pinout
9.3
P2 – MICRO-USB, FACTORY USE ONLY
P2 is a standard USB2.0 Micro-B connector and conforms to the industry standard
USB2.0 Pinout. It is connected to the CM4 USB OTG Port via a 2:1 switch. It is provided
to allow programming of CM4 modules with built-in eMMC. It is not used for modules
that have no eMMC.
