Datasheet

LTC2991
27
2991fd
For more information www.linear.com/LTC2991
Typical applicaTions
Wind Direction/Instrumentation
V
CC
V1
LTC2991
3.3V
µC
GND
MMBT3904 MMBT3904
SDA
SCL
ADR0
ADR1
ADR2
V3
V4
V2
2991 TA10
3.3V
HEATER
75Ω
0.125W
T
AMBIENT
CONTROL REGISTER 0x06 0xAA
T
AMBIENT
REG 1A, 1B 0.0625°C/LSB
T
R1
REG 0A, 0B 0.0625°C/LSB
T
R2
REG 0E, 0F 0.0625°C/LSB
V
CC
REG 1C, 1D 2.5V + 305.18µV/LSB
2N7002
HEATER ENABLE
2 SECOND PULSE
OTHER APPS
V5 TO V8
4
Liquid Level Indicator
V
CC
LTC2991
3.3V
µC
GND
SDA
SCL
ADR0
ADR1
ADR2
V1
V4
V3
V2
3.3V
T
AMBIENT
CONTROL REGISTER 0x06 = 0xAA
T
AMBIENT
REG 1A, 1B: 0.0625°C/LSB
T
DRY
REG 0A, 0B: 0.0625°C/LSB
T
WET
REG 0C, 0D: 0.0625°C/LSB
V
CC
REG 1C, 1D: 2.5V + 305.18µV/LSB
NDS351AN
2991 TA09
*HEATER: 75Ω 0.125W
*SENSOR MMBT3904, DIODE CONNECTED
SENSOR LO*
∆T = ~2.0°C pp, SENSOR HI
~0.2°C pp, SENSOR LO
SENSOR HI*
HEATER ENABLE
2 SECOND PULSE
HEATER ENABLE
SENSOR HI
SENSOR LO
OTHER APPS
V5 TO V8
4