DS2756(2006) Ver la hoja de datos (PDF) - Maxim Integrated
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DS2756 Datasheet PDF : 26 Pages
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DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode
Table 1. PIO/DQ Pin Function
REGISTER BIT SETTING
PIO/DQ PIN FUNCTION
PIE IOS IE PIO
xx
x
x
0 PIO pin: GPIO¾Output LOW
00
x
0
1 PIO pin: GPIO¾Output High-Z, Input mode
00
0
1
00
1
1
00
1
1
01
10
x
x
11
x¾Don’t care.
1 PIO pin: Alarm Comparator Interrupt Output
0
DQ pin: Alarm Comparator Interrupt Output (low for tIL)
PIO pin: GPIO¾Output LOW
1
DQ pin: Alarm Comparator Interrupt Output (low for tIL)
PIO pin: GPIO¾Output High-Z, Input mode
1 PIO pin: Suspend Interrupt Output
SUSPEND THRESHOLDS
The suspend thresholds set the current level to enter and exit Suspend mode. The threshold levels are
programmable with a magnitude range of 0 to 4mV, and are compared against the value in the Current register.
Values are programmed in two’s complement format with an implied sign bit in a virtual 9th bit position. The Charge
Suspend Threshold register is always a positive value. The Discharge Suspend Threshold register is always a
negative value.
The thresholds define an inclusive, continuous range of currents in which the DS2756 enters or re-enters Suspend
mode from Active mode. The Charge Suspend Threshold represents the minimum measured charge current which
will cause the DS2756 to transition modes. The Discharge Suspend Threshold represents the minimum discharge
current which will cause the DS2756 to transition modes.
The user values of the suspend thresholds are programmed into two bytes located within EEPROM block 0. These
memory locations serve as current threshold values only when either PIE bit is set, and can be used as general
purpose EEPROM if PIE = 00b. A copy command is required to save the byte values to EEPROM. See the
Memory section for information on copying shadow RAM to EEPROM.
Figure 9. Charge Suspend Threshold Format
Address 35h
27 26 25 24 23 22 21 20
MSb
LSb
15.625mV/RSNS
Figure 10. Discharge Suspend Threshold Format
Address 34h
27 26
MSb
25 24 23 22 21 20
LSb
15.625mV/RSNS
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