ISM43907-L170-
EVB User’s Manual
DOC-907UM-2017-1.0
Confidential
Inventek Systems
Page 12
8
POWER SUPPLY
8.1 Power source
The ISM43907-L170-EVB is designed to be powered by a 5 V DC power supply.
It is possible to configure the evaluation board to use any of following two sources for the power
supply:
•5 V External power source hole on the board. The JP4 need connect Pin1 and pin2
•5 V DC power with 500 mA limitation from P1, the USB Micro-AB connecter, The JP4 need
connect Pin2 and pin3
8.2 Reset source
The reset signal of the ISM43907-L170-EVB board is low active and the reset source includes:
•Reset button SW1.
8.3 Audio
The ISM43907-L170-EVB board enables two channels of I2S function, one channel is
connection to header (J4) and another is connection to header (J3).
8.4 UART
The ISM43907-L170-EVB board enables one fast channel of UART and two slow channels of
UART communication. Fast UART is connect to Header J12 (Pin8, pin 10, pin12, and pin14).
1st channel of slow UART (UART1) connects to R6, R8 & U1 (USB to UART IC), and Header J4
(Pin17, Pin19). 2nd Channel of slow UART connects to header J4 (Pin23 & Pin25).
8.5 PWM
The ISM43907-L170-EVB board enables PWM control signal and connects to header J4.
8.6 I2C
The ISM43907-L170-EVB board enables
two channels of I2C function. One channel connects to
J3 (Pin26 & Pin28). Another channel connects to J3 (pin27 & Pin29).
•I2C signal traces need to pull high.
•I2C signal traces need to pull high.
