Remote ?癈 Accurate Digital Temperature
Sensors with SPI-Compatible Serial Interface
4  _______________________________________________________________________________________
0
50
100
150
200
250
300
3.0
4.0
3.5
4.5
5.0
5.5
AVERAGE OPERATING CURRENT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
MAX6627
MAX6628
-3
-2
-1
0
1
2
3
-55
-5
-30
20   45   70   95  120  145
TEMPERATURE ERROR vs. TEMPERATURE
TEMPERATURE (癈)
T
A
 = +25癈
T
A
 = 0癈
MAX6627
T
A
 = +70癈
0.6
1.0
0.8
1.4
1.2
1.8
1.6
2.0
2.4
2.2
2.6
-55
-5   20   45
-30
70   95  120  145
POWER-ON-RESET THRESHOLD
vs. TEMPERATURE o
TEMPERATURE (癈)
Typical Operating Characteristics
(V
CC
= +3.3V, T
A
= +25癈, unless otherwise noted.)
PIN
NAME
FUNCTION
1
GND
Ground
2
DXN
Combined Current Sink and ADC Negative Input for Remote Diode. DXN is normally biased to a diode
voltage above ground.
3
DXP
Combined Current Source and ADC Positive Input for Remote Diode. Place a 2200pF capacitor between
DXP and DXN for noise filtering.
4
V
CC
Supply Voltage Input. Bypass with a 0.1礔 to GND.
5
SCK
SPI Clock Input
6
CS
Chip Select Input. Pulling CS low initiates an idle state, but the SPI interface is still enabled. A rising edge
of CS initiates the next conversion.
7
SDO
SPI Data Output
8
N.C.
No Connect. Internally not connected. Can be connected to GND for improved thermal conductivity.

EP
Exposed Pad. Internally connected to GND. Connect to a large ground plane to maximize thermal
performance. Not intended as an electrical connection point.
Pin Description
10
100k
10M
1k
100
10k
1M
100M
TEMPERATURE ERROR vs.
POWER-SUPPLY NOISE FREQUENCY
FREQUENCY (Hz)
0
4
2
6
8
10
12
V
IN
= SQUARE WAVE
APPLIED TO V
CC
WITH NO
0.1糉 CAPACITOR
V
IN
 = 250mVp-p
0
25
50
75
100
125
-2
2
0
4    6    8    10   12   14
RESPONSE TO THERMAL SHOCK
TIME (s)
0
1
3
2
4
5
CAPACITANCE (pF)
0
10,000
5000
15,000    20,000
TEMPERATURE ERROR
vs. DXP/DXN CAPACITANCE
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