DS2703 Dallas Semiconductor, DS2703 Datasheet - Page 3

• Manufacturer Part Number: DS2703
• Description: SHA-1 Battery Pack Authentication IC
• Manufacturer: Dallas Semiconductor

AC ELECTRICAL CHARACTERISTICS
(V
AC ELECTRICAL CHARACTERISTICS: 1-Wire INTERFACE
(V
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
1-Wire INTERFACE REGULAR TIMING
Time Slot
Recovery Time
Write 0 Low Time
Write 1 Low Time
Read Data Valid Time
Reset Time High
Reset Time Low
Presence Detect High
Presence Detect Low
1-Wire INTERFACE OVERDRIVE TIMING
Time Slot
Recovery Time
Write 0 Low Time
Write 1 Low Time
Read Data Valid Time
Reset Time High
Reset Time Low
Presence Detect High
Presence Detect Low
THM Low Delay
Computation Delay Time
Computation Time
Programming Pulse Width
Programming Pulse Rise Time
Programming Pulse Fall Time
Start-up Delay Time
PULLUP
PULLUP
V
The application thermistor cannot exceed the R
recommended that a 50KΩ resistor be connected between DQ and THM pins instead.
Maximum leakage of DQ pin while in thermistor mode.
When performing a Lock Secret (0x6A), Set Overdrive (0x8B) or Clear Overdrive (0x8D) operation, there will be an increased operating current of I
IDLE
pulse.
See Figure 11 for definitionof t
All voltages referenced to VSS.
V
Drive strength at time=0 after Activate Thermistor command is sent to the DS2703.
Does not include capacitance referred from VB pin on initial power up.
EEPROM data read retention is four years at +50°C
Time from msb of Activate Thermistor command until THM pin is driven low internally.
Time from msb of Compute Next Secret or Compute MAC command.
Time after initial power up before the DS2703 will respond to communication. T
Worst case 100ms delay based on maximum thermistor value of 500kΩ.
= 2.7V to 5.5V, T
= 2.7V to 5.5V, T
DQ
DQ
PARAMETER
PARAMETER
during the time period from when the command is issued until the next 1-Wire bus reset. I
– V
must be at least 3.0V when the 1-Wire bus is idle.
THM
. The THM pin must not be driven to a higher voltage than the DQ pin.
A
A
= -20°C to +70°C.)
= -20°C to +70°C.)
PPR
, t
PPW
, and t
SYMBOL
SYMBOL
PPF.
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
LOW0
LOW1
t
t
t
LOW0
LOW1
t
t
STRT
RSTH
t
RSTH
t
SLOT
RSTL
SLOT
RSTL
t
PPW
SHA
PPR
REC
RDV
PDH
REC
RDV
PDH
PPF
PDL
PDL
t
DQ-THM
TD
D
resistance range over operating temperature. If thermistor mode is not used in the application, it is
(Note 11)
(Note 12)
(Note 12)
(Note 5)
(Note 13)
3 of 20
CONDITIONS
CONDITIONS
STRT
specifications are valid only if the capacitor on VB (C
PGM-IDLE
current will be present before and after the program
MIN
100
MIN
480
480
0.5
0.5
17
60
60
15
60
48
48
1
1
6
1
6
1
2
8
TYP
TYP
MAX
MAX
100
120
120
960
240
15
15
15
15
60
16
16
80
24
5
5
2
2
6
VB
) is 0.22µF.
UNITS
UNITS
PGM-
ms
ms
ms
µs
µs
µs
ms
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs