ACT5880
Rev 2, 03-Sep-13
PIN DESCRIPTIONS
PIN
H6
H7
H8
NAME
VALIVE
AUX0
GD
DESCRIPTION
The Always-On Low Power LDO Output. Bypass to GA with a 1μF high quality ceramic capacitor.
The Auxiliary ADC Input AUX0.
The Ground Node of the ADC Circuit in the IC.
One of ADC Input, Internally Configured as the Touch Screen Force-Sense Node XPOS with an
internal force switch.
H9
J1
XPOS
The 32kHz Oscillation Output, OD. A pull-up resistor at load end in range of 150kꢀ to 300kꢀ is
recommended.
CLK32
J2
J3
VP1
The Switch Power Input Node of the Step-down DC/DC REG1. Same function as pin H2.
The Step-down DC/DC REG1 Feedback Node. Connect it to the output node of REG1.
OUT1
The 32kHz Oscillator Crystal Node. This node is pick-up node. Connect it to any terminal of an
external crystal.
J4
J5
XTAL-
XTAL+
The 32kHz Oscillator Crystal Node. This node is driving node. Connect it to any terminal of an
external crystal.
The Back-up Battery Node. Connect it to the positive node of a back-up battery or storage super cap.
The back-up battery charger circuit charges battery or super cap at this node with limited current
and outputs a programmable voltage after charging for powering the always-on low power LDO.
J6
VBBAT
J7
J8
J9
AUX1
BBCIN
AUX2
The Auxiliary ADC Input AUX1.
The Back-up Battery Charger Circuit Input. Bypass to GA with a 1μF high quality ceramic capacitor.
The Auxiliary ADC Input AUX2.
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