MAX7501 Maxim, MAX7501 Datasheet - Page 3

• Manufacturer Part Number: MAX7501
• Description: Digital Temperature Sensors and Thermal Watchdog with Bus Lockup Protection
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(+V
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
I
Serial Clock Frequency
Minimum RESET Pulse Width
Bus Free Time Between STOP
and START Conditions
START Condition Hold Time
STOP Condition Setup Time
Clock Low Period
Clock High Period
START Condition Setup Time
Data Setup Time
Data Hold Time
Maximum Receive SCL/SDA Rise
Time
Minimum Receive SCL/SDA Rise
Time
Maximum Receive SCL/SDA Fall
Time
Minimum Receive SCL/SDA Fall
Time
Transmit SDA Fall Time
Pulse Width of Suppressed Spike
SDA Time Low for Reset of Serial
Interface
2
C-COMPATIBLE TIMING (Note 10)
S
= +3.0V to +5.5V, T
PARAMETER
All parts operate properly over the +V
accuracy at their nominal supply voltage. Accuracy typically degrades 1°C per volt of change in +V
nominal value.
All parameters are measured at +25°C. Values over the temperature range are guaranteed by design.
This specification indicates how often temperature data is updated. The devices can be read at any time without regard
to conversion state, while yielding the last conversion result.
For best accuracy, minimize output loading. Higher sink currents can affect sensor accuracy due to internal heating.
OS delay is user programmable up to six “over-limit” conversions before OS is set to minimize false tripping in noisy
environments.
Default values set at power-up.
All timing specifications are guaranteed by design.
A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s
falling edge.
C
Input filters on SDA, SCL, and A_ suppress noise spikes less than 50ns.
Holding the SDA line low for a time greater than t
bus communication (SDA set high).
B
= total capacitance of one bus line in pF. Tested with C
Digital Temperature Sensors and Thermal
_______________________________________________________________________________________
A
Watchdog with Bus Lockup Protection
= -55 C to +125 C, unless otherwise noted. Typical values are at +V
SYMBOL
t
t
t
t
t
TIMEOUT
t
HD:STA
SU:STO
SU:DAT
HD:DAT
SU:STA
t
t
t
f
HIGH
LOW
BUF
t
SCL
t
t
SP
t
t
t
R
R
F
F
F
S
Bus timeout inactive
90% of SCL to 10% of SDA
90% of SCL to 90% of SDA
10% of SDA to 10% of SCL
10% of SCL to 10% of SDA (Note 11)
(Note 12)
(Note 12)
(Note 12)
(Note 13)
(Note 14)
= 3V to 5V supply voltage range. The devices are tested and specified for rated
TIMEOUT
CONDITIONS
causes the devices to reset SDA to the IDLE state of the serial
B
= 400pF.
S
= +5V, T
0.1 x
20 +
MIN
100
100
100
150
DC
1.3
0.6
1.3
0.6
C
1
0
0
B
A
0.1 x
0.1 x
= +25 C.) (Notes 4, 5)
TYP
20 +
20 +
300
300
C
C
B
B
S
as it varies from the
MAX
400
250
300
0.9
50
UNITS
kHz
ms
µs
µs
µs
ns
µs
µs
ns
ns
µs
ns
ns
ns
ns
ns
ns
3