LTC6802IG-1#PBF Linear Technology, LTC6802IG-1#PBF Datasheet - Page 32

• Manufacturer Part Number: LTC6802IG-1#PBF
• Description: IC MONITOR BATT STACK MC 44-SSOP
• Manufacturer: Linear Technology

Specifications of LTC6802IG-1#PBF

• Function: Battery Monitor
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 4 V ~ 50 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 44-SOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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