4
Remote/Local Temperature Sensor
with SMBus Serial Interface
MAX1617
Maxim Integrated
0
6
3
9
12
50
5k
500k
50k
5M
500
50M
TEMPERATURE ERROR vs.
POWER-SUPPLY NOISE FREQUENCY
FREQUENCY Hz
V
IN
 = SQUARE WAVE APPLIED TO
V
CC
 WITH NO 0.1糉 V
CC
 CAPACITOR
V
IN
 = 250mVp-p
REMOTE DIODE
V
IN
 = 250mVp-p
LOCAL DIODE
V
IN
 = 100mVp-p
REMOTE DIODE
-20
-10
0
10
20
1
10
30
3
100
TEMPERATURE ERROR
vs. PCB RESISTANCE
LEAKAGE RESISTANCE (M?
PATH = DXP TO V
CC
 (5V)
PATH = DXP TO GND
-2
-1
0
1
2
-50
50
100
0
150
TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
TEMPERAT RE ?/DIV>
SAMSUNG KST3904
MOTOROLA MMBT3904
ZETEX FMMT3904
RANDOM
SAMPLES
__________________________________________Typical Operating Characteristics
(T
A
= +25癈, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V, T
A
= -55癈 to +125癈, unless otherwise noted.) (Note 1)
Note 1:  All devices 100% production tested at T
A
= +85癈. Limits over temperature are guaranteed by design.
Note 2:  Guaranteed but not 100% tested.
Note 3:  Quantization error is not included in specifications for temperature accuracy. For example, if the MAX1617 device tempera-
ture is exactly +66.7癈, the ADC may report +66癈, +67癈, or +68癈 (due to the quantization error plus the +1/2癈 offset
used for rounding up) and still be within the guaranteed ?癈 error limits for the +60癈 to +100癈 temperature range. See
Table 2.
Note 4:  A remote diode is any diode-connected transistor from Table 1. T
R
is the junction temperature of the remote diode. See
Remote Diode Selection for remote diode forward voltage requirements.
Note 5:  The SMBus logic block is a static design that works with clock frequencies down to DC. While slow operation is possible, it
violates the 10kHz minimum clock frequency and SMBus specifications, and may monopolize the bus.
Note 6:  Note that a transition must internally provide at least a hold time in order to bridge the undefined region (300ns max) of
SMBCLKs falling edge.
CONDITIONS
UNITS
MIN
TYP
MAX
PARAMETER
STBY, SMBCLK, SMBDATA
2.2
Logic Input High Voltage
V
2.4
STBY, SMBCLK, SMBDATA; V
CC
= 3V to 5.5V
V
0.8
Logic Input Low Voltage
ALERT forced to 5.5V
1
ALERT Output High Leakage
Current
Logic inputs forced to V
CC
or GND
-2
2
Logic Input Current
V
CC
= 3V
V
CC
= 5.5V
ALERT, SMBDATA forced to 0.4V
mA
6
Logic Output Low Sink Current
SMBus INTERFACE
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