Datasheet

LTC2990
21
Rev. F
For more information www.analog.com
Fan/Air Filter/Temperature Alarm
V
CC
V1
LTC2990
2-WIRE
I
2
C
INTERFACE
3.3V
GND
470pF
22Ω
0.125W
HEATER
NDS351AN
TEMPERATURE FOR:
HEATER ENABLE
GOOD FAN
BAD FAN
FAN
MMBT3904
MMBT3904
SDA
SCL
ADR0
ADR1
V3
V4
V2
2990 TA06
T
INTERNAL
HEATER ENABLE
2 SECOND PULSE
CONTROL REGISTER: 0x5D
T
AMB
REG 4, 5 0.0625°C/LSB
T
R1
REG 6, 7 0.0625°C/LSB
T
R2
REG A, B 0.0625°C/LSB
V
CC
REG E, F 2.5V + 305.18µV/LSB
470pF
3.3V
22Ω
0.125W
FAN
0.1µF
TYPICAL APPLICATIONS
V
CC
V1
LTC2990
BATTERY I AND V MONITOR
15mΩ*
CHARGING
CURRENT
2-WIRE
I
2
C
INTERFACE
5V
GND
470pF
NiMH
BATTERY
V(t)
100% 100%
• • •
T
BATT
MMBT3904
SDA
SCL
ADR0
ADR1
V3
V4
V2
2990 TA07
T
INTERNAL
*IRC LRF3W01R015F
CURRENT AND TEMPERATURE CONFIGURATION:
CONTROL REGISTER: 0x59
T
AMB
REG 4, 5 0.0625°C/LSB
I
BAT
REG 6, 7 1.295mA/LSB
T
BAT
REG A, B 0.0625°C/LSB
V
CC
REG E, F 2.5V + 305.18µV/LSB
VOLTAGE AND TEMPERATURE CONFIGURATION:
CONTROL REGISTER: 0x58
T
AMB
REG 4, 5 0.0625°C/LSB
V
BAT
REG 8, 9 305.18µVLSB
T
BAT
REG A, B 0.0625°C/LSB
V
CC
REG E, F 2.5V + 305.18µV/LSB
+
T(t)
100%
I(t)
0.1µF
Battery Monitoring
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.