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DS2761AX-025 Datasheet(PDF) 10 Page - Dallas Semiconductor |
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DS2761AX-025 Datasheet(HTML) 10 Page - Dallas Semiconductor |
10 / 24 page 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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