57
19
HPFE
I
High Pass Filter Enable Pin
"L": Disable
"H": Enable
20
TEST
I
Test Pin ( pull-down pin)
Should be connected to GND.
21
BGND
-
Substrate Ground Pin, 0V
22
AGND
-
Analog Ground Pin, 0V
23
VA
-
Analog Supply Pin, 5V
24
AINR-
I
Rch Analog negative input Pin
25
AINR+
I
Rch Analog positive input Pin
26
VCOMR
O
Rch Common Voltage Pin, 2.75V
27
GNDR
-
Rch Reference Ground Pin, 0V
28
VREFR
O
Rch Reference Voltage Pin, 3.75V
Normally connected to GNDR with a 10µF electrolytic capacitor
and a 0.1µF ceramic capacitor
Note: All digital inputs should not be left floating
QA07, QU71 : PCF8574
Pin Description
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