LTC6802-1_1 LINER [Linear Technology], LTC6802-1_1 Datasheet - Page 32

• Manufacturer Part Number: LTC6802-1_1
• Description: Multicell Battery Stack Monitor
• Manufacturer: LINER [Linear Technology]

LTC6802-1
APPLICATIONS INFORMATION
stack potential. Figure 18 shows a means of providing both
of these features. A resistor divider is used to provide a
low-voltage representation of the full stack potential (C12
to C0 voltage) with MOSFETs that decouple the divider
current under unneeded conditions. Other MOSFETs, in
conjunction with an op amp having a shutdown mode,
form a voltage selector that allows measurement of the
normal cell1 potential (when GPIO1 is low) or a buffered
MUX signal. When the MUX is active (GPIO1 is high),
32
CELL12
CELL1
Figure 18. Providing Measurement of Calibration Reference and Full-Stack Voltage Through CELL1 Port
100Ω
LTC6802-1
TP0610K
GPIO2
GPIO1
WDTB
V
TP0610K
REG
C1
V
−
0 = REF_EN
0 = CELL1
1M
1μF
100nF
150Ω
2N7002
1M
2.2M
2N7002
1M
TP0610K
TP0610K
10M
selection can be made between the reference (4.096V) or
the full-stack voltage divider (GPOI2 set low will select the
reference). During idle time when the LTC6802-1 WTB signal
goes low, the external circuitry goes into a power down
condition, reducing battery drain to a minimum. When not
actively performing measurements, GPIO1 should be set
low and GPIO2 should be set high to achieve the lowest
power state for the configuration shown.
1M
90.9k
V
STACK12
SD
LT1636
+
–
DNC
V
SD
GND
LT1461A-4
IN
1M
V
DNC
DNC
DNC
OUT
2.2μF
COM
V
4.096V
DD
TC4W53FU
CH0
INH
CH1
V
EE
SEL
V
SS
68021 F18
68021fa