ds2761 Maxim Integrated Products, Inc., ds2761 Datasheet - Page 10

• Manufacturer Part Number: ds2761
• Description: Ds2761 High-precision Li+ Battery Monitor
• Manufacturer: Maxim Integrated Products, Inc.

Figure 7. VOLTAGE REGISTER FORMAT
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
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 V
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
monitored for a low-impedance connection to V
on the
DS2761 is already in active mode, activity on
level in the
followed by writing a 1 to the
the
PS
bit.
PS
MSb
MSb
S
S
pin causes the device to transition into active mode, turning on the discharge FET. If the
PS
2
2
bit in the special feature register. The reading of a 0 in the
9
9
MSB—Address 0C
MSB—Address 18
2
2
8
8
2
2
PS
7
7
pin, internally pulled to V
2
2
PS
6
6
bit to ensure that a subsequent low forced on the
2
2
5
5
2
2
4
4
LSb
LSb
2
2
3
3
SS
PS
10 of 24
. If the DS2761 is in sleep mode, the detection of a low
has no effect other than the latching of its logic low
MSb
MSb
DD
2
2
2
2
through a 1mA current source, is continuously
2
2
1
1
LSB—Address 0D
LSB—Address 19
2
2
0
0
X
X
PS
X
X
bit should be immediately
X
X
PS
Units: 0.125°C
Units: 4.88mV
pin is latched into
X
X
SS
LSb
LSb
. Writing a 1
X
X