参数资料
型号: DS2790G+T&R
厂商: Maxim Integrated Products
文件页数: 37/41页
文件大小: 0K
描述: IC FUEL GAUGE BATT 28-TDFN
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: 锂离子(Li-Ion)
电源电压: 2.5 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-TDFN
供应商设备封装: 28-TDFN-EP(8x4)
包装: 带卷 (TR)
DS2790 Programmable 1-Cell Li-Ion Fuel Gauge and Protector
V OCP by internally pulling CC and DC up to the CP voltage. The system designer should consider the following
when selecting external FETs:
?
?
Gate to Source voltage. The external FETs must be able to withstand a voltage between their gate and
source pins of at least the charge pump voltage V OCP to prevent damage.
Gate leakage. The gate leakage of both external FETs must be smaller than 0.9μA to ensure CC and
DC meet the V OCP specification.
PASSWORD PROTECTED USER TRIM
System software has the ability to change Temperature and Voltage protection levels, 2-wire slave address, and
current measurement gain of the IC through the User Trim in Program EEPROM (Word Addresses 001Dh–001Fh).
The user trim values are enabled through the Trim Key in the lower byte of address 001Dh. If the Trim Key is set to
76h, the user trim values replace the default trim values, if the Trim Key is set to any other value, default trim is
selected. Note that either all user trim values are enabled or none are enabled. Figure 20 shows the format of all
values that can be adjusted and their default trim values.
Figure 20. User Trim Registers
ADDRESS
001Dh
BIT DEFINITION
Field
Unused
Slave
Address
Bit
15
14:8
Format
R/W
R/W
Allowable Values
Undefined ? General purpose
2-Wire Slave Address
Valid only if Trim Key = 76h
Default = 0001011b
Trim Key
Trim Key
7:0
R/W
Enables or disables all other user trim values.
76h = All User Trim values valid.
Other = All User Trim values invalid. Default trim used.
ADDRESS
001Eh
BIT DEFINITION
Field
Bit
Format
Allowable Values
Current Gain Trim
These bits adjust the current gain by ±25%. The most significant
bit is the 2’s compliment sign bit, 1LSB = 0.195%.
IG
15:8
R/W
Example: A4h (-92d) adjusts the trim by -17.94%.
Valid only if Trim Key = 76h
Default = Factory trim value
Sense Resistor Temperature Coefficient
These bits adjust the current gain based on temperature of the
sense resistor. 1LSB = 30.5ppm/oC.
SRTC
7:0
R/W
Example: 1Ah (26d) adjusts current measurements for a sense
resistor with a 793ppm/oC temperature coefficient.
Valid only if Trim Key = 76h
Default = 00h
37 of 41
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