M.2 Maker boards comparison This is an attempt to better understand the similarities and differences between the existing boards.
Pin
Key E (1-SD)
Google
makerdiary
Particle
SparkFun
Sipeed
WRTnode
SNAPZZ gen.1
1
GND
GND
GND
GND
GND
IO39
UART1_RX
GND
2
3.3V
3.3V
3.3V
VCC
3.3V
5V
3.3V.
3.3V
3
USB_DP
NC
USB_DP
GND
USB_DP
IO37
GND
USB-DP
4
3.3V
3.3V
3.3V
VCC
3.3V EN
5V
3.3V
3.3V
5
USB_DM
NC
USB_DM
GND
USB_DM
IO38
GND
USB-DN
6
LED1#(I)(OD)
NC
P0.19
VCC
RESET#
GND
UART1_TX
NC
7
GND
GND
GND
GND
GND
IO36
USB_DP
NC
8
PCM (1.8V)
NC
P0.20
VCC
G11
GND
WLED
NC
9
SDIO (1.8V)
NC
P0.11
GND
USB_VIN
IO34
USB_DM
NC
10
PCM (1.8V)
NC
P0.21
3.3V
D0
RST
LINK0
NC
11
SDIO (1.8V)
NC
P0.12
USB_DP
BOOT
IO35
GND
NC
12
PCM (1.8V)
NC
P0.22
3.3V
I2C_SDA
Key B slot
Key B slot
NC
13
SDIO (1.8V)
NC
P1.08
USB_DN
UART_RTS1
Key B slot
Key B slot
NC
14
PCM (1.8V)
NC
P0.23
RSV
I2C_SCL
Key B slot
Key B slot
NC
15
SDIO (1.8V)
NC
P1.09
GND
UART_CTS1
Key B slot
Key B slot
NC
16
LED2#
NC
P0.24
VUSB
I2C_INT#
Key B slot
Key B slot
NC
17
SDIO (1.8V)
NC
P0.08
NFC1
UART_TX1
Key B slot
Key B slot
NC
18
GND
GND
GND
RSV
D1
Key B slot
Key B slot
NC
19
SDIO (1.8V)
NC
P0.07
NFC2
UART_RX1
Key B slot
Key B slot
NC
20
UART_WAKE#(3.3V)
NC
P0.25
SCL
UART_RX2
IO47
LINK1
NC
21
SDIO (1.8V)
NC
P0.06
GND
SWDCK
IO32
LINK2
NC
22
UART RXD (1.8V)
NC
P0.16
SDA
UART_TX2
IO45
LINK3
NC
23
SDIO (1.8V)
NC
P0.05 / AIN3
ADC0
SWDIO
IO33
LINK4
GPIO-0
24
Key E slot
Key E slot
Key E slot
Key E slot
Key E slot
IO43
RXIP0
Key E slot
25
Key E slot
Key E slot
Key E slot
Key E slot
Key E slot
IO30
REF_CLK0
Key E slot
26
Key E slot
Key E slot
Key E slot
Key E slot
Key E slot
IO41
RXIN0
Key E slot
27
Key E slot
Key E slot
Key E slot
Key E slot
Key E slot
IO31
GND
Key E slot
28
Key E slot
Key E slot
Key E slot
Key E slot
Key E slot
IO40
TXOP0
Key E slot
29
Key E slot
Key E slot
Key E slot
Key E slot
Key E slot
IO28
TXON4
Key E slot
30
Key E slot
Key E slot
Key E slot
Key E slot
Key E slot
IO42
TXON0
Key E slot
31
Key E slot
Key E slot
Key E slot
Key E slot
Key E slot
IO29
TXOP4
Key E slot
32
UART TXD (1.8V)
NC
P0.15
MODE
PWM0
IO44
RXIN4
NC
33
GND
GND
GND
ADC1
GND
IO26
GND
NC
34
UART CTS (1.8V)
NC
P0.14
RESET
A0
IO46
RXIP4
NC
35
PETp0
PERn0
RSV
ADC2
USBHOST_DP
IO27
RXIN3
NC
36
UART RTS (1.8V)
NC
P0.13
TX
GND
IO8
TXON3
NC
37
PETn0
PERp0
RSV
ADC3
USBHOST_DM
IO24
RXIP3
NC
38
VENDOR
RST_EN
RESET / P0.18
RX
A1
IO6
TXOP3
IO4
39
GND
GND
GND
AGND
GND
IO25
GND
NC
40
VENDOR
NC
SWDIO
CTS
G0 / BUS0
IO5
TXON2
USB_TTL-TX
41
PERp0
PETp0
RSV
ADC4
CAN_RX
IO22
PCIE_TXN
NC
42
VENDOR
NC
SWDCLK
RTS
G1 / BUS1
IO4
TXOP2
USB_TTL-RX
43
PERn0
PETn0
RSV
ADC5
CAN_TX
IO23
PCIE_TXP
IO3
44
COEX (1.8V)
NC
P1.00
MOD USB_DP
G2 / BUS2
SPI0_D7
RXIN2
NC
45
GND
GND
GND
ADC6
GND
IO20
GND
NC
46
COEX (1.8V)
NC
P1.01
MOD USB_DM
G3 / BUS3
SPI0_D6
RXIP2
NC
47
REFCLKp0
REFCLKp0
RSV
ADC7
PWM1
IO21
PCIE_RXN
NC
48
COEX (1.8V)
NC
P1.02
CS
G4 / BUS4
SPI0_D5
GPIO0
USB-tgt-sel
49
REFCLKn0
REFCLKn0
RSV
AGND
BATT_VIN
IO18
PCIE_RXP
NC
50
SUSCLK (32KHz)
NC
RSV
MISO
AUD_BCLK
SPI0_D4
PERSTN
NC
51
GND
GND
GND
RSV
I2C_SDA1
IO19
GND
NC
52
PERST0# (3.3V)
PERST0# (3.3V)
RSV
MOSI
AUD_LRCLK
SPI0_D3
RXIN1
NC
53
CLKREQ0# (3.3V)
CLKREQ0# (3.3V)
RSV
RSV
I2C_SCL1
BOOT
PCIE_CKN
I2C_SCL1
54
W_DISABLE (3.3V)
NC
P1.03
SCK
AUD_IN
SPI0_D2
RXIP1
NC
55
PEWAKE0 (3.3V)
GND
RSV
RSV
SPI_CS
IO17
PCIE_CKP
I2C_SDA1
56
W_DISABLE (3.3V)
NC
P1.04
GND
AUD_OUT
SPI0_D1
TXON1
NC
57
GND
GND
GND
RSV
SPI_SCK
IO14
GND
NC
58
SDA
NC
P1.05
RSV
AUD_MCLK
SPI0_D0
TXOP1
I2C_SDA
59
PETp1
PERn1
P0.04 / AIN2
RSV
SPI_COPI
IO16
UART0_RX
NC
60
SDC
NC
P1.06
RSV
SDIO_SCK
DVP_D0
UART0_TX
I2C_SCL
61
PETn1
PERp1
P0.26
RED
SPI_CIPO
IO12
SPI_MOSI
NC
62
ALERT# (3.3V)
ALERT# (3.3V)
P1.07
GPIO0
SDIO_CMD
DVP_D1
SPI_MISO
NC
63
GND
GND
GND
GREEN
G10
IO13
SPI_CLK
NC
64
VENDOR
NC
VBUS
GPIO1
SDIO_DATA0
DVP_D2
SPI_CS1
Mod-RST_EN
65
PERp1
PETp1
P0.27
BLUE
G9
IO10
SDA
NC
66
PERST1# (3.3V)
PERST1# (3.3V)
RSV
PWM0
SDIO_DATA1
DVP_D3
SCLK
NC
67
PERn1
PETn1
P0.28 / AIN4
SIM_VCC
G8
IO11
I2S_CLK
NC
68
CLKREQ1# (3.3V)
CLKREQ1# (3.3V)
RSV
PWM1
SDIO_DATA2
DVP_D4
I2S_WS
IO2
69
GND
GND
GND
SIM_RST
G7 / BUS7
IO9
I2S_SDO
NC
70
GPIO1/REWAKE1#
NC
RSV
PWM2
SDIO_DATA3
DVP_D5
3.3V
IO1
71
REFCLKp1
REFCLKp1
P0.03 / AIN1
SIM_CLK
G6 / BUS6
IO7
GND
NC
72
3.3V
3.3V
3.3V
PWM3
RTC_3V_BATT
DVP_D6
3.3V
3.3V
73
REFCLKn1
REFCLKn1
P0.02 / AIN0
SIM_DATA
G5 / BUS5
3.3V
GND
NC
74
3.3V
3.3V
3.3V
MOD VBUS
3.3V
DVP_D7
3.3V
3.3V
75
GND
GND
GND
MOD RI
GND
1.8V
I2S_SDI
NC
Dimension
Google
makerdiary
Particle
SparkFun
Sipeed
WRTnode
SNAPZZ gen.1
Key
Type E
Type E
Type E
Type E
Type B
Type B
Type E
Width
22 mm
22 mm
30 mm
22 mm
22 mm
22 mm
22 mm
Length
30 mm
30 mm
42 mm
22 mm
25 mm
42 mm
30 / 40 mm
Height
2.8 mm
2.1 mm
5.5 mm
2.7 mm
3.5 mm
1.8 mm
Screw pos
Center
Center
Center
Offset, key
Center
Center
Centre