Product Name
EK-AI7931LD
Version
E
Doc No
912-13802
Date
2022/11/14
Page
11 / 26
PRODUCT USER GUIDE
www.acsip.com.tw
Table 1 Jumper settings for system power input through USB connection
Jumper
Usage
Comments
J1
External 5V power supply
Use external power source to supply 5V voltage to EK-AI7931LD
PCB. Pin 1 is 5V source. Pin2 is GND.
J2
DC-5V transfer to DC-3V3 current
source
J3
Current measurement (3V3)
Measures the current flow in AI7931LD module.
J4
3V3 for EEPROM power
EEPROM has no parts.
J5
3V3 for external components
J25
AVDD33_VRTC battery power supply
Use AA or AAA battery for RTC 3V3 power. Pin1 is positive
endpoint, Pin2 is GND.
J26
Current measurement in RTC mode
RTC mode For AI7933CLD only.
J27
3V3 for SD_CARD power
JP1
Switch VCCIO_L to 3V3 power domain
or 1V8 power domain
Select pin 1 & 2, means VCCIO_L use 3V3 power domain
Select pin 2 & 3, means VCCIO_L use 1V8 power domain
JP2
Switch VCCIO to 3V3 power domain
or 1V8 power domain
Select pin 1 & 2, means VCCIO use 3V3 power domain
Select pin 2 & 3, means VCCIO use 1V8 power domain
Caution: The flash of AI7931LD default using 3V3 power domain, if
you want to change VCCIO to 1V8 power domain please rework
flash to 1V8 power domain flash (eq. W25Q128JWPIQ)
JP3
Switch 1V8 VCCIO from internal
PHYLDO or external LDO
Select pin 2 & 3, means 1V8 VCCIO from internal PHYLDO
Select pin 1 & 2, means 1V8 VCCIO from external Buck
component
JP5
Switch RTC 3V3 from DC-3V3 or
AVDD33_VRTC
Select pin 1 & 2, means RTC_3V3 use DC-3V3
Select pin 2 & 3, means RTC_3V3 use AVDD33_VRTC
JP7
Switch SD Card to 3V3 power domain
or 1V8 power domain
Select pin 1 & 2, means SD_CARD power use 1V8 power domain
Select pin 2 & 3, means SD_CARD power use 3V3 power domain
JP9
Switch EEPROM(NC) to 3V3 power
domain or 1V8 power domain
Select pin 1 & 2, means EEPROM power use 3V3 power domain
Select pin 2 & 3, means EEPROM power use 1V8 power domain
J88
5V for (U10) Audio AMP power
Pin 1 is EXUSB_5V
J89
5V for (U10) Audio AMP using
Pin 1 is EXUSB_5V
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ip
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