Remote/Local Temperature Sensor
with SMBus Serial Interface
MAX1617A
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V,
T
A
= -55°C to +125°C,
unless otherwise noted.) (Note 6)
PARAMETER
SMBus INTERFACE
Logic Input High Voltage
Logic Input Low Voltage
Logic Output Low Sink Current
ALERT
Output High Leakage
Current
Logic Input Current
STBY,
SMBCLK, SMBDATA
V
CC
= 3V
V
CC
= 5.5V
2.2
2.4
0.8
6
1
-2
2
V
V
mA
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
STBY,
SMBCLK, SMBDATA; V
CC
= 3V to 5.5V
ALERT,
SMBDATA forced to 0.4V
ALERT
forced to 5.5V
Logic inputs forced to V
CC
or GND
Note 1:
Guaranteed but not 100% tested.
Note 2:
Quantization error is not included in specifications for temperature accuracy. For example, if the MAX1617A device temper-
ature is exactly +66.7°C, the ADC may report +66°C, +67°C, or +68°C (due to the quantization error plus the +1/2°C offset
used for rounding up) and still be within the guaranteed ±1°C error limits for the +60°C to +100°C temperature range
(Table 2).
Note 3:
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 4:
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 5:
Note that a transition must internally provide at least a hold time in order to bridge the undefined region (300ns max) of
SMBCLK’s falling edge.
Note 6:
Specifications from -55°C to +125°C are guaranteed by design, not production tested.
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
TEMPERATURE ERROR
vs. PC BOARD RESISTANCE
MAX1617ATOC01
TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX1617ATOC02
TEMPERATURE ERROR vs.
POWER-SUPPLY NOISE FREQUENCY
V
IN
= SQUARE WAVE APPLIED TO
V
CC
WITH NO 0.1µF V
CC
CAPACITOR
TEMPERATURE ERROR (°C)
9
V
IN
= 250mVp-p
REMOTE DIODE
MAX1617ATOC04
20
2
12
TEMPERATURE ERROR (°C)
10
TEMPERATURE ERROR (°C)
PATH = DXP TO GND
1
ZETEX FMMT3904
0
MOTOROLA MMBT3904
SAMSUNG KST3904
-1
RANDOM
SAMPLES
-2
0
6
V
IN
= 250mVp-p
LOCAL DIODE
3
V
IN
= 100mVp-p
REMOTE DIODE
-10
PATH = DXP TO V
CC
(5V)
-20
1
3
10
30
100
LEAKAGE RESISTANCE (MΩ)
0
-50
0
50
TEMPERATURE (°C)
100
150
50
500
5k
50k
500k
5M
50M
FREQUENCY (Hz)
4
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
