ES51998(60000counts)
DMM Analog front end/Insulation
2.13 Multi-level battery voltage indication
The ES51998 is built-in a comparator for batter voltage indication. The voltage is applied to
LBAT pin (pin 89) vs. V- terminal. MPU could check the status bit BTS1/BTS0 and monitor
the LBAT voltage status.
Battery voltage
VLBT > Vt1
Vt2 < VLBT < Vt1
Vt3 < VLBT < Vt2
VLBT < Vt3
BTS1
BST0
1
1
0
0
1
0
1
0
Low battery configuration for 9V/1.5V*4/1.5V*3 battery
Low battery test circuit (a)
Low battery test circuit (b)
6V
9V
360K
BA
470K
BA
LBAT
LBAT
TT
0.1u
TT
0.1u
AGND
V-
AGND
V-
270K
180K
0V
0V
Low battery test circuit (c)
4.5V
360K
BA
LBAT
TT
0.1u
AGND
V-
470K
0V
ver. 1.7
27
12/01/12
CYRUSTEK [ Cyrustek corporation ]
