Manual

DS1841
Temperature-Controlled, NV, I
2
C,
Logarithmic Resistor
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
DS1841 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.04.54.03.53.0
50
100
150
200
250
0
2.5 5.5
SDA = SCL = VCC
RH, RH, RW ARE FLOATING
SDA = SCL = V
CC
RGND, RH, RW ARE FLOATING
UPDATE MODE BIT = 0UPDATE MODE BIT = 0
LUT MODE AND LUT ADDER MODE
UPDATE MODE BIT = 1
LUT MODE AND LUT ADDER MODE
UPDATE MODE BIT = 1
SUPPLY CURRENT
vs. TEMPERATURE
DS1841 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
806040200-20
50
100
150
200
250
0
-40 100
SDA = SCL = VCC
RH, RH, RW ARE FLOATING
SDA = SCL = V
CC
= 5V
RGND, RH, RW ARE FLOATING
UPDATE MODE BIT = 0UPDATE MODE BIT = 0
LUT MODE AND LUT ADDER MODE
UPDATE MODE BIT = 1
LUT MODE AND LUT ADDER MODE
UPDATE MODE BIT = 1
SUPPLY CURRENT
vs. SCL FREQUENCY
DS1841 toc03
SCL FREQUENCY (kHz)
SUPPLY CURRENT (mA)
300200100
50
100
150
200
250
0
0 400
SDA = SCL = VCC
RH, RH, RW ARE FLOATING
SDA = V
CC
= 5V
RGND, RH, RW ARE FLOATING
UPDATE MODE BIT = 0UPDATE MODE BIT = 0
LUT MODE AND LUT ADDER MODE
UPDATE MODE BIT = 1
LUT MODE AND LUT ADDER MODE
UPDATE MODE BIT = 1
WIPER RESISTANCE (RW)
vs. SETTING
DS1841 toc04
SETTING (DEC)
WIPER RESISTANCE (kΩ)
125100755025
5
10
15
20
25
0
0
SDA = SCL = V
CC
= 5VSDA = SCL = V
CC
= 5V
WIPER CURRENT
vs. WIPER SETTING
DS1841 toc05
WIPE SETTING (DEC)
WIPER CURRENT (mA)
100755025
0.4
0.8
1.2
1.6
0
0 125
RGND = 0V
RW OPEN
FORCE 1.25V ON RH AND
MEASURE CURRENT
RGND = 0V
RW OPEN
FORCE 1.25V ON RH AND
MEASURE CURRENT
VCC = 5V
SDA AND SCL REFERENCED TO 5V
V
CC
= 5V
SDA AND SCL REFERENCED TO 5V
RW TO RGND RESISTANCE
vs. SUPPLY VOLTAGE
DS1841 toc06
SUPPLY VOLTAGE (V)
RESISTANCE AT RW (kΩ)
5.04.54.03.53.02.52.01.51.00.5
10
20
30
40
0
0 5.5
POR OCCURSPOR OCCURS
IVR IS LOADED
IVR IS LOADED
CONVERSIONS COMPLETE
LUT VALUE LOADED TO WR
CONVERSIONS COMPLETE
LUT VALUE LOADED TO WR
Typical Operating Characteristics
(V
CC
= +2.7V to +5.5V, T
A
= +25°C, unless otherwise noted.)
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