Datasheet

LTC2990
20
2990fc
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
Wet-Bulb Psychrometer
V
CC
V1
LTC2990
5V
μC
GND
470pF
T
DRY
T
WET
MMBT3904 MMBT3904
SDA
SCL
ADR0
ADR1
V3
V4
V2
2990 TA08
470pF
T
INTERNAL
DAMP MUSLIN
WATER
RESERVOIR
CONTROL REGISTER: 0x5D
T
AMB
REG 4, 5 0.0625°C/LSB
T
WET
REG 6, 7 0.0625°C/LSB
T
DRY
REG A, B 0.0625°C/LSB
V
CC
REG E, F 2.5V + 305.18μV/LSB
$T
NDS351AN
FAN ENABLE
5V
FAN
FAN: SUNON
KDE0504PFB2
0.1μF
REFERENCES:
http://en.wikipedia.org/wiki/Hygrometer
http://en.wikipedia.org/wiki/Psychrometrics
Wind Direction/Instrumentation
V
CC
V1
LTC2990
3.3V
μC
GND
470pF
MMBT3904 MMBT3904
SDA
SCL
ADR0
ADR1
V3
V4
V2
2990 TA11
470pF
3.3V
HEATER
75Ω
0.125W
T
INTERNAL
CONTROL REGISTER: 0x5D
T
AMB
REG 4, 5 0.0625°C/LSB
T
R1
REG 8, 9 0.0625°C/LSB
T
R2
REG A, B 0.0625°C/LSB
V
CC
REG E, F 2.5V + 305.18μV/LSB
2N7002
HEATER ENABLE
2 SECOND PULSE
0.1μF