MAX1620 Datasheet, PDF (8/20 Pages) Maxim Integrated Products – Digitally Adjustable LCD Bias Supplies

Digitally Adjustable LCD Bias Supplies
______________________________________________________________Pin Description
PIN
MAX1620 MAX1621
1
—
—
1
2
—
—
2
3
3
4
—
—
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
NAME
FUNCTION
DN
SDA
UP
SCL
BATT
SHDN
SUS
POK
REF
POL
LCDON
FB
DOUT
V_DD
AGND
PGND
LX
DLO
DHI
Logic-Level Input. A rising edge on DN decreases V_OUT. UP = DN = high resets
the counter to mid-scale.
System Management Bus Serial-Data Input and Open-Drain Output
Logic-Level Input. A rising edge on UP increases V_OUT. UP = DN = high resets
the counter to mid-scale.
System Management Bus Serial-Clock Input
Battery Voltage-Sense Input
Logic-Level Shutdown Input (active-low)
System Management Bus Suspend-Mode Input (active-low)
Power OK Voltage-Sense Input, 1V threshold
Reference Voltage Output. Bypass REF with 0.1µF to AGND.
Logic-Level Input. POL selects output voltage polarity: high = positive boost,
low = negative boost.
Open-Drain Output. LCDON controls LCD with external PNP.
Feedback Voltage Input
DAC Output Voltage
IC Input Supply, 3.0V to 5.5V
Analog Ground
Power Ground
Switching-Voltage Sense Input
External Transistor Drive, Low
External Transistor Drive, High
8 _______________________________________________________________________________________