HiKey(LeMaker version):Low Speed Expansion Connector

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Introduction

The Low Speed (LS) Expansion connector carries GPIO and other low speed interfaces. The connector is a low profile 40 pins (20x2) 2mm female receptacle with a specified height 4.5mm (as it is shown in the image #Low Speed Expansion Connector on board).
The low speed expansion brings out 1.8V level SoC signals such as UART2 and UART3, I2C0 and I2C1, GPIO signals as well as SPI, PCM, Reset, VCC 1.8V and GND Ground.

Low Speed Expansion Connector definition

Pin on Board Pin Definition Pin on board Pin Definition
1 DGND 2 DGND
3 UART2_CTS_N 4 PMU_PWRON_N
5 UART2_TX 6 EXP_RSTOUT_N
7 UART2_RX 8 SPIO_SCLK
9 UART2_RST_N 10 SPIO_DI
11 UART3_TX 12 SPIO_CS_N
13 UART3_RX 14 SPIO_DO
15 I2CO_SCL 16 MODEM_PCM_XFS
17 I2CO_SDA 18 MODEM_PCM_XCLK
19 I2C1_SCL 20 MODEM_PCM_DO
21 I2C1_SDA 22 MODEM_PCM_DI
23 GPIO2_0 24 GPIO2_1
25 GPIO2_2 26 GPIO3_3
27 GPIO2_4 28 BL_PWM_GPIO12_7
29 GPIO6_7_DSI_TE0 30 GPIO2_7
31 ISP_RSTB0_GPIO10_3 32 ISP_PWDN0_GPIO9_1
33 ISP_RSTB1_GPIO10_3 34 ISP_PWDN0_GPIO9_2
35 LDO21_1V8 36 SYSDC_IN
37 SYS_5V 38 SYSDC_IN
39 DGND 40 DGND

Low Speed Expansion Connector on board

Hikey-1.png