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3.6.1 Breakout Pads
Twenty breakout pads, which follow the EXP header pinout, are provided and allow connection of peripherals or add-on boards. Ten of
the pads are located along the left side of the board and ten are located on the right side. The breakout pads expose I/O pins that can
be used with most of the ZGM230S's features. Additionally, the VMCU (main power rail), 3V3 (LDO regulator output), and 5V power
rails are also exposed.
The breakout pads are pinned out similar to the EXP header found on other Silicon Labs Starter Kits, which ensures that commonly
used peripherals such as SPI, UART, and I
2
C buses are available on fixed locations. The rest of the pins are used for general purpose
IO. The EXP header allows the definition of EXP boards that can plug into a number of different Silicon Labs starter kits.
The pin-routing on ZGM230S is very flexible, so most peripherals can be routed to any pin. However, pins may be shared between the
breakout pads and other functions on the ZGM230S Dev Kit. The table below includes an overview of the EXP header and functionality
that is shared with the kit.
Table 3.2. Expansion Header Pinout
Pin
Connection
EXP Header Function
Shared Feature
Right Side Breakout Pins
2
VMCU
ZGM230S voltage domain, included in AEM measurements.
4
PC01
SPI_COPI
IMU & Flash
6
PC02
SPI_CIPO
IMU & Flash
8
PC03
SPI_SCLK
IMU & Flash
10
PC00
SPI_CS
IMU
12
PA08
UART_TX
Virtual COM Port
14
PA09
UART_RX
Virtual COM Port
16
PB06
I2C_SDA
Sensor I2C bus
18
5V
Board USB voltage
20
3V3
Board controller supply
Left Side Breakout Pins
1
GND
Ground
3
PB03
GPIO
Button 0
5
PB02
GPIO
Button 1
7
PC05
GPIO
9
PC06
GPIO
11
PD02
GPIO
13
PA04
GPIO
15
PB05
I2C_SCL
Sensor I2C bus
17
BOARD_ID_SCL
Connected to Board Controller for identification of add-on boards.
19
BOARD_ID_SDA
Connected to Board Controller for identification of add-on boards.
UG532: ZGM230S Dev Kit User's Guide
Hardware
silabs.com
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