Rainbow-electronics MAX6691 Bedienungsanleitung Seite 3

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MAX6691
Four-Channel Thermistor Temperature-to-Pulse-
Width Converter
_______________________________________________________________________________________ 3
SLEEP-MODE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6691 toc01
SUPPLY VOLTAGE (V)
SLEEP-MODE SUPPLY CURRENT (µA)
5.04.54.03.5
3.0
3.5
4.0
4.5
2.5
3.0 5.5
T
HIGH
/T
LOW
ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6691 toc02
POWER-SUPPLY NOISE FREQUENCY (MHz)
T
HIGH
/T
LOW
FULL-SCALE ERROR (%)
2015105
-0.5
0
0.5
1.0
-1.0
025
V
CC
= 5.0V
V
CC
= 3.3V
V
IN
= SQUARE WAVE
APPLIED TO V
CC
WITH
NO VCC BYPASS
CAPACITOR
V
IN
= 250mV
P-P
T
HIGH
/T
LOW
ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6691 toc03
POWER-SUPPLY NOISE FREQUENCY (MHz)
T
HIGH
/T
LOW
FULL-SCALE ERROR (%)
2015105
-0.5
0
0.5
1.0
-1.0
025
T
A
= +25°C
T
A
= -55°C
T
A
= +85°C
T
A
= +125°C
V
IN
= SQUARE WAVE
APPLIED TO V
CC
WITH
NO VCC BYPASS
CAPACITOR
V
IN
= 250mV
P-P
__________________________________________Typical Operating Characteristics
(V
CC
= 5V, R
EXT
= 7.5k, R
TH
= 12.5k, T
A
= +25°C, unless otherwise noted.)
PIN NAME FUNCTION
1 T1 Thermistor 1. Connect to external thermistor 1.
2 T2 Thermistor 2. Connect to external thermistor 2.
3 T3 Thermistor 3. Connect to external thermistor 3.
4 T4 Thermistor 4. Connect to external thermistor 4.
5 R- External Resistor Low Side. Connect R
EXT
between R- and R+.
6 R+ Reference Voltage Output. Connect R
EXT
between R- and R+.
7 GND Ground. Ground connection for MAX6691 and ground return for external thermistor(s).
8 N.C. No Connection. Do not make a connection to this pin.
9 I/O I/O Connection to Microcontroller. Connect a 10k pullup resistor from I/O pin to V
CC
.
10 V
CC
Supply Voltage. Bypass V
CC
to GND with a capacitor of at least 0.1µF.
Pin Description
Seitenansicht 2
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