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DS2761AX Datasheet(PDF) 10 Page - Dallas Semiconductor

Part # DS2761AX
Description  High-Precision Li Battery Monitor
PDF  24 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS2761AX Datasheet(HTML) 10 Page - Dallas Semiconductor

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DS2761
10 of 24
Figure 7. VOLTAGE REGISTER FORMAT
MSB—Address 0C
LSB—Address 0D
S29
28
27
26
25
24
23
22
21
20
XXXX
X
MSb
LSb
MSb
LSb
Units: 4.88mV
TEMPERATURE MEASUREMENT
The DS2761 uses an integrated temperature sensor to continually measure battery temperature.
Temperature measurements are placed in the temperature register every 220ms in two’s-complement
format with a resolution of 0.125°C over a range of
±127°C. The temperature register format is shown in
Figure 8.
Figure 8. TEMPERATURE REGISTER FORMAT
MSB—Address 18
LSB—Address 19
S29
28
27
26
25
24
23
22
21
20
XXXX
X
MSb
LSb
MSb
LSb
Units: 0.125
°C
PROGRAMMABLE I/O
To use the PIO pin as an output, write the desired output value to the PIO bit in the special feature
register. Writing a 0 to the PIO bit enables the PIO output driver, pulling the PIO pin to VSS. Writing a 1
to the PIO bit disables the output driver, allowing the PIO pin to be pulled high or used as an input. To
sense the value on the PIO pin, read the PIO bit. The DS2761 turns off the PIO output driver and sets the
PIO bit high when in sleep mode or when DQ is low for more than 2s, regardless of the state of the
PMOD bit.
POWER SWITCH INPUT
The DS2761 provides a power control function that uses the discharge protection FET to gate battery
power to the system. The PS pin, internally pulled to VDD through a 1
mA current source, is continuously
monitored for a low-impedance connection to VSS. If the DS2761 is in sleep mode, the detection of a low
on the PS pin causes the device to transition into active mode, turning on the discharge FET. If the
DS2761 is already in active mode, activity on PS has no effect other than the latching of its logic low
level in the PS bit in the special feature register. The reading of a 0 in the PS bit should be immediately
followed by writing a 1 to the PS bit to ensure that a subsequent low forced on the PS pin is latched into
the PS bit.



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