MAX1668_03 Datasheet, PDF (4/17 Pages) Maxim Integrated Products – Multichannel Remote/Local Temperature Sensors

Multichannel Remote/Local
Temperature Sensors
ELECTRICAL CHARACTERISTICS (continued)
(V_CC = +5V, STBY = V_CC, configuration byte = X0XXXX00, T_A = -55°C to +125°C, unless otherwise noted.) (Note 6)
PARAMETER
CONDITIONS
MIN TYP MAX
SMBus INTERFACE
Logic Input High Voltage
STBY, SMBCLK, SMBDATA; V_CC = 4.5V to 5.5V
2.4
Logic Input Low Voltage
STBY, SMBCLK, SMBDATA; V_CC = 4.5V to 5.5V
0.8
Logic Output Low Sink Current
ALERT, SMBDATA forced to 0.4V
6
ALERT Output High Leakage
Current
ALERT forced to 5.5V
1
Logic Input Current
Logic inputs forced to V_CC or GND
-2
+2
UNITS
V
V
mA
µA
µA
Note 1: Guaranteed by design, but not production tested.
Note 2: Quantization error is not included in specifications for temperature accuracy. For example, if the MAX1668/MAX1805/
MAX1989 device temperature is exactly +66.7°C, the ADC may report +66°C, +67°C, or +68°C (due to the quantization
error plus the +0.5°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. See 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 the
Remote-Diode Selection section 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 can 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 t_HD:DAT.
Note 6: Specifications from -55°C to +125°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Typical Operating Circuit, V_CC = +5V, STBY = V_CC, configuration byte = X0XXXX00, T_A = +25°C, unless otherwise noted.)
TEMPERATURE ERROR
vs. PC BOARD RESISTANCE
20
10
PATH = DXP_ TO GND
0
TEMPERATURE ERROR
vs. TEMPERATURE
4
3
NPN (CMPT3904)
2
PNP (CMPT3906)
1
TEMPERATURE ERROR
vs. SUPPLY NOISE FREQUENCY
24
WITH V_CC 0.1µF CAPACITOR REMOVED
2200pF BETWEEN DXN_ AND DXP_
20
250mV_P-P
16
12
0
-10
PATH = DXP_ TO V_CC (5V)
-1
INTERNAL
8
100mV_P-P
4
-20
1
10
100
LEAKAGE RESISTANCE (MΩ)
-2
-50 -30 -10 10 30 50 70 90 110
TEMPERATURE (°C)
0
0.1
1
10
100
FREQUENCY (MHz)
4 _______________________________________________________________________________________