User Manual

08-00040-01
VN400 Hardware Integration Application Note
Page 5/16
Proprietary & Confidential – NIVIS LLC
The following section presents the I/O connector pin assignments of the VN400.
An external processing entity can talk to the VN400 using UART and SPI communication channels. The current channel used
for application communication is selected by J2-pin25 (PTA5).
The UART port is also used for serial firmware upload under J1-pin17 control (BOOT_SW).
Figure 2 shows the VN400 pin assignments on the 30 pins Hirose high density connector.
Note: For minimum battery consumption, all unused GPIOs should be left unconnected.
Figure 2. VN400 J2 Pinout