DS2703U+T&R Maxim Integrated Products, DS2703U+T&R Datasheet - Page 9

• Manufacturer Part Number: DS2703U+T&R
• Description: IC BATT AUTHENTICATE SHA-1 8UMAX
• Manufacturer: Maxim Integrated Products

Specifications of DS2703U+T&R

• Function: Battery Authentication
• Battery Type: Lithium-Ion (Li-Ion)
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SET OVERDRIVE [8Bh]. This command sets the 1-Wire Overdrive bit to select the Overdrive 1-Wire timings
shown in the Electrical Characteristics table. The Overdrive bit is stored in EEPROM so that the programmed
speed selection can be recalled on initial power up. The host must apply a programming pulse to complete the
command.
Table 5. 1-Wire Speed Control Function Commands
Clear Overdrive
Set Overdrive
THERMISTOR MEASUREMENT
The DS2703’s 1-Wire interface allows a thermistor to be multiplexed on the DQ line for thermal measurements of
the cell pack without adding an additional pack connection. See the Typical Operating Circuit, Figure 5. The
thermistor is connected between the DQ and THM pins. THM is normally high impedance to prevent the thermistor
from interfering with 1-Wire communication. When an Activate THM command is received, THM is internally driven
to VSS and the DQ pin becomes high impedance allowing the thermistor resistance to be measured. See the
timing diagram in Figure 12.
Figure 2. Thermistor Mode Duration when C
COMMAND
1000
800
600
400
200
0
2.7
Operation Restored
Normal Mode of
3.1
HEX
8D
8B
3.5
Clears the Overdrive 1-Wire Speed bit to select Standard 1-Wire
timings
Sets the Overdrive 1-Wire Speed bit to select Overdrive 1-Wire
timings
DQ Pullup Voltage (V)
3.9
9 of 20
VB
is .22µF
Measurement Period
Valid Thermistor
4.3
FUNCTION
4.7
Worst Case Quickest
Worst Case Slowest
5.1
Transition Time
Typical Transition
Transition
Time
5.5