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MAX31855
Cold-Junction Compensated
Thermocouple-to-Digital Converter
THERMAL CHARACTERISTICS (continued)
(3.0V P V CC P 3.6V, T A = -40 N C to +125 N C, unless otherwise noted.) (Note 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Thermocouple Temperature Data
Resolution
0.25
N C
Internal Cold-Junction
Temperature Error
Cold-Junction Temperature Data
Resolution
T A = -20 N C to +85 N C (Note 3)
T A = -40 N C to +125 N C (Note 3)
T A = -40 N C to +125 N C
-2
-3
0.0625
+2
+3
N C
N C
Temperature Conversion Time
(Thermocouple, Cold Junction,
Fault Detection)
Thermocouple Conversion
Power-Up Time
t CONV
t CONV_PU
(Note 5)
(Note 6)
200
70
100
ms
ms
SERIAL-INTERFACE TIMING CHARACTERISTICS
(See Figure 1 and Figure 2 .)
PARAMETER
Input Leakage Current
SYMBOL
I LEAK
(Note 7)
CONDITIONS
MIN
-1
TYP
MAX
+1
UNITS
μA
Input Capacitance
Serial-Clock Frequency
SCK Pulse-High Width
SCK Pulse-Low Width
SCK Rise and Fall Time
CS Fall to SCK Rise
SCK to CS Hold
CS Fall to Output Enable
CS Rise to Output Disable
SCK Fall to Output Data Valid
CS Inactive Time
C IN
f SCL
t CH
t CL
t CSS
t DV
t TR
t DO
(Note 3)
100
100
100
100
200
8
5
200
100
40
40
pF
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
Note 2:
Note 3:
Note 4:
Note 5:
All voltages are referenced to GND. Currents entering the IC are specified positive, and currents exiting the IC are negative.
Guaranteed by design; not production tested.
Not including cold-junction temperature error or thermocouple nonlinearity.
Specification is 100% tested at T A = +25 N C. Specification limits over temperature (T A = T MIN to T MAX ) are guaranteed by
design and characterization; not production tested.
Note 6: Because the thermocouple temperature conversions begin at V POR , depending on V CC slew rates, the first thermocouple
temperature conversion may not produce an accurate result. Therefore, the t CONV_PU specification is required after V CC is
greater than V CCMIN to guarantee a valid thermocouple temperature conversion result.
Note 7: For all pins except T+ and T- (see the Thermocouple Input Bias Current parameter in the DC Electrical Characteristics
table).
Maxim Integrated
4
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相关代理商/技术参数
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