Rainbow Electronics MAX1621 - Manual (Page 8)

MAX1620/MAX1621
Digitally Adjustable LCD Bias Supplies
8 _______________________________________________________________________________________
External Transistor Drive, High DHI 16 16
External Transistor Drive, Low DLO 15 15
Switching-Voltage Sense Input LX 14 14
Power Ground PGND 13 13
Analog Ground AGND 12 12
IC Input Supply, 3.0V to 5.5V V DD 11 11
DAC Output Voltage
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.
Logic-Level Input. A rising edge on UP increases  V
OUT
 . UP = DN = high resets
the counter to mid-scale.
DOUT
System Management Bus Serial-Clock Input
Battery Voltage-Sense Input
System Management Bus Serial-Data Input and Open-Drain Output
10
Logic-Level Input. A rising edge on DN decreases

V OUT

. UP = DN = high resets
the counter to mid-scale.
10
FUNCTION
SHDN — 4
SUS 4 —
POK 5 5
REF 6 6
POL 7 7
UP — 2
Feedback Voltage Input FB 9
SCL 2 —
BATT 3 3
SDA 1 —
9
Open-Drain Output. LCDON controls LCD with external PNP. LCDON 8
DN — 1
8
MAX1621 MAX1620
NAME
PIN
______________________________________________________________Pin Description