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| 型号： | DS2438Z+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/29页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR SMART BATTERY 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 智能电池 |
| 电源电压： | 2.4 V ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
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DS2438
THRESHOLD REGISTER FORMAT Table 6
TH2
TH1
0
0
0
0
0
0
MSb
LSb
TH2
0
0
1
1
TH1
0
1
0
1
THRESHOLD
None (default)
±2 LSB
±4 LSB
±8 LSB
The Charging Current Accumulator (CCA) is a two-byte nonvolatile read/write counter which represents
the total charging current the battery has encountered in its lifetime. It is only updated when current
through R SENS , is positive; i.e., when the battery is being charged. Similarly, the Discharge Current
Accumulator (DCA) is a two-byte nonvolatile counter which represents the total discharging current the
battery has encountered over its lifetime.
The CCA and DCA can be configured to function in any of three modes: disabled, enabled with shadow-
to-EEPROM, and enabled without shadow-to-EEPROM. When the CCA and DCA are disabled (by
setting either the IAD bit or the CA bit in the Status/Configuration Register to “0”), the memory in page
07h is free for general purpose data storage. When the CCA and DCA are enabled (by setting both IAD
and CA to “1”), page 07h is reserved for these registers, and none of the bytes in page 07h should be
written to via the 1-Wire bus. When the CCA and DCA are enabled, their values are automatically
shadowed to EEPROM memory by setting the EE bit in the Status/Configuration Register to “1”. When
these registers are configured to shadow to EEPROM, the information will accumulate over the lifetime
of the battery pack and will not be lost when the battery becomes discharged. Shadow-to-EEPROM is
disabled when the EE bit is “0”. Table 7 illustrates the format of the CCA and DCA registers. Table 8
summarizes the modes of operation for ICA, CCA and DCA.
CCA/DCA REGISTER FORMAT Table 7
2 7
2 6
2 5
2 4
2 3
2 2
2 1
2 0
LSB
MSb
(unit = 15.625 mVHr)
LSb
2 15
2 14
2 13
2 12
2 11
2 10
2 9
2 8
MSB
ICA/CCA/DCA MODES OF OPERATION Table 8
IAD Bit
CA Bit
EE Bit
ICA
CCA/DCA
CCA/DCA Copy-
to-EEPROM
0
1
1
1
X
0
1
1
X
X
0
1
Inactive
Active
Active
Active
Inactive
Inactive
Active
Active
Inactive
Inactive
Inactive
Active
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