DS2703 SHA-1 Battery Pack Authentication IC

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AC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

THM Low Delay

(Note 11)

15

ms

Computation Delay Time

(Note 12)

100

µs

Computation Time

(Note 12)

15

ms

Programming Pulse Width

(Note 5)

17

ms

Programming Pulse Rise Time

0.5

5

µs

Programming Pulse Fall Time

0.5

5

µs

Start-up Delay Time

(Note 13)

100

ms

AC ELECTRICAL CHARACTERISTICS: 1-Wire INTERFACE

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

1-Wire INTERFACE REGULAR TIMING

Time Slot

60

120

µs

Recovery Time

1

µs

Write 0 Low Time

60

120

µs

Write 1 Low Time

1

15

µs

Read Data Valid Time

15

µs

Reset Time High

480

µs

Reset Time Low

480

960

µs

Presence Detect High

15

60

µs

Presence Detect Low

60

240

µs

1-Wire INTERFACE OVERDRIVE TIMING

Time Slot

6

16

µs

Recovery Time

1

µs

Write 0 Low Time

6

16

µs

Write 1 Low Time

1

2

µs

Read Data Valid Time

2

µs

Reset Time High

48

µs

Reset Time Low

48

80

µs

Presence Detect High

2

6

µs

Presence Detect Low

8

24

µs

Note 1:

Note 2:

recommended that a 50KΩ resistor be connected between DQ and THM pins instead.

Note 3:

Maximum leakage of DQ pin while in thermistor mode.

Note 4:

pulse.

Note 5:

Note 6:

All voltages referenced to VSS.

Note 7:

Note 8:

Drive strength at time=0 after Activate Thermistor command is sent to the DS2703.

Note 9:

Does not include capacitance referred from VB pin on initial power up.

Note 10:

EEPROM data read retention is four years at +50°C

Note 11:

Time from msb of Activate Thermistor command until THM pin is driven low internally.

Note 12:

Time from msb of Compute Next Secret or Compute MAC command.

Note 13:

Worst case 100ms delay based on maximum thermistor value of 500kΩ.