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©2021 Sharp NEC Display Solutions, Ltd. Page 10 of 86
o A temperature sensor within the display automatically starts the cooling fans when
needed. Additionally, the Compute Module itself can request the cooling fans run by
driving GPIO 24 to a high state. This is compatible with the Raspberry Pi OS Fan GPIO
control mechanism.
• Status indicator
o LED indicator on the Raspberry Pi Compute Module Interface Board shows the status of
power (red) and activity (orange).
GPIO Summary
• GPIO 14 & 15 (UART0 TX & RX) – internal serial connection to the display for control
• GPIO 18 – (input to Compute Module) demodulated IR receiver from the display
• GPIO 23 – (input to Compute Module) shutdown signal
• GPIO 24 – (output from the Compute Module) cooling fan control
See section 3.5 GPIO on page 27 for more details.
Interface Board internal connections and jumpers
• A jumper header labeled EEPEOM_nWP on the Interface Board can be used to write-protect the
Compute Module’s EEPROM by installing a jumper across the two pins.
• (DS1-IF21CE interface board only.) A jumper header labeled
WF_nDisable on the Interface
Board can be used to disable the Compute Module’s Wi-Fi function by installing a jumper across
the two pins.
Requirements
• Compatible NEC display models
o M431
o M491
o M551
o
M651
o MA431
o MA491
o MA551
o ME431
o ME501
o ME551
o
ME651
o P435
o P495
o P555
• NEC Compute Module 4 Interface Board
o DS1-IF20CE or DS1-IF21CE
• Raspberry Pi Compute Module 4
o Supports all eMMC based variants, including all RAM and wireless configurations.
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