Typical operating characteristics, Pin description – Rainbow Electronics MAX6691 User Manual
Page 3
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 (
µ
A)
5.0
4.5
4.0
3.5
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 (%)
20
15
10
5
-0.5
0
0.5
1.0
-1.0
0
25
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 (%)
20
15
10
5
-0.5
0
0.5
1.0
-1.0
0
25
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
Ω, R
TH
= 12.5k
Ω, 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
Ω 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