DS2756E+TR MAXIM [Maxim Integrated Products], DS2756E+TR Datasheet - Page 11

• Manufacturer Part Number: DS2756E+TR
• Description: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 1. PIO/DQ Pin Function
x¾Don’t care.
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 9
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
Figure 10. Discharge Suspend Threshold Format
PIE
00
00
00
00
01
10
11
xx
REGISTER BIT SETTING
IOS
0
1
1
x
x
x
IE
0
1
1
1
x
x
PIO
0
1
1
0
1
1
PIO pin: GPIO¾Output LOW
PIO pin: GPIO¾Output High-Z, Input mode
PIO pin: Alarm Comparator Interrupt Output
DQ pin: Alarm Comparator Interrupt Output (low for t
PIO pin: GPIO¾Output LOW
DQ pin: Alarm Comparator Interrupt Output (low for t
PIO pin: GPIO¾Output High-Z, Input mode
PIO pin: Suspend Interrupt Output
MSb
MSb
2
2
7
7
2
2
6
6
2
2
5
5
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Address 35h
Address 34h
PIO/DQ PIN FUNCTION
2
2
4
4
2
2
3
3
15.625mV/R
15.625mV/R
2
2
2
2
2
2
1
1
LSb
LSb
SNS
SNS
2
2
0
0
IL
IL
)
)
th
bit position. The Charge