CFA633-RDI-KS datasheet(55/88 Pages) CRYSTAIFONTZ

55 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 55

FOUR FUNCTIONS MAY BE ENABLED BY COMMAND 28

Function 1: KEYPAD_RESET

If POWER-ON SENSE (GPIO[1]) is high, holding the green check key for 4 seconds will pulse RESET (GPIO[3]) pin for

1 second. During the 1-second pulse, the CFA633 will show "RESET", and then the CFA633 will reset itself, showing its

boot state as if it had just powered on. Once the pulse has finished, the CFA633 will not respond to any commands until

after it has reset the host and itself.

Function 2: KEYPAD_POWER_ON

If POWER-ON SENSE (GPIO[1]) is low, pressing the green check key for 0.25 seconds will pulse POWER CONTROL

(GPIO[2]) for the duration specified by in data[1] or the default of 1 second. During this time the CFA633 will show

"POWER ON", then the CFA633 will reset itself.

Function 3: KEYPAD_POWER_OFF

If POWER-ON SENSE (GPIO[1]) is high, holding the red X key for 4 seconds will pulse POWER CONTROL (GPIO[2])

for the duration specified by in data[1] or the default of 1 second. If the user continues to hold the power key down, then

the CFA633 will continue to drive the line for a maximum of 5 additional seconds. During this time the CFA633 will show

"POWER OFF".

Function 4: LCD_OFF_IF_HOST_IS_OFF

If LCD_OFF_IF_HOST_IS_OFF is set, the CFA633 will blank its screen and turn off its backlight to simulate its power

being off any time POWER-ON SENSE is low.

NOTE

By default there is an internal POWER-ON-SENSE connected to the +5v pin of J_PWR, selected by

setting data[2] to 1. Alternatively, GPIO[1] may be configured to act as POWER-ON-SENSE through

R21 of 5K, and specifying data[2] as 0. The CFA633 will still be active (since it is powered by VSB,

standby power which is always-on), monitoring the keypad for a power-on keystroke. Once POWER-

ON SENSE goes high, the CFA633 will reboot as if power had just been applied to it.

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