LTC2990CMS View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2990CMS' PDF : 24 Pages View PDF
Typical ApplicationS
Wet-Bulb Psychrometer
5V
0.1µF
VCC V1
V2
MMBT3904 MMBT3904
µC
SDA
V3
SCL LTC2990
ADR0
470pF
$T
ADR1 GND
V4
TDRY
TWET
470pF
2990 TA08
CONTROL REGISTER: 0x5D
TAMB
TWET
TDRY
VCC
REG 4, 5
REG 6, 7
REG A, B
REG E, F
TINTERNAL FAN: SUNON
KDE0504PFB2
0.0625°C/LSB
FAN
0.0625°C/LSB
5V
0.0625°C/LSB
2.5V + 305.18µV/LSB
DAMP MUSLIN
WATER
RESERVOIR
FAN ENABLE
NDS351AN
REFERENCES:
http://en.wikipedia.org/wiki/Hygrometer
http://en.wikipedia.org/wiki/Psychrometrics
LTC2990
Liquid-Level Indicator
3.3V
3.3V
0.1µF
VCC
V1
µC
SDA
V2
SCL LTC2990
ADR0
V3
ADR1 GND
V4
470pF
470pF
TINTERNAL HEATER ENABLE
2 SECOND PULSE
CONTROL REGISTER: 0x5D
TAMB
THI
TLO
VCC
REG 4, 5
REG 6, 7
REG A, B
REG E, F
0.0625°C/LSB
0.0625°C/LSB
0.0625°C/LSB
2.5V + 305.18µV/LSB
SENSOR HI*
HEATER ENABLE
SENSOR LO*
NDS351AN
SENSOR HI
SENSOR LO
$T = ~2.0°C pp, SENSOR HI
~0.2°C pp, SENSOR LO
HEATER: 75Ω 0.125W
*SENSOR MMBT3904, DIODE CONNECTED
2290 TA09
2990f
21
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