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参数资料
| 型号： | BQ26221PWR |
| 厂商： | Texas Instruments |
| 文件页数： | 10/23页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MONITOR HP 8-TSSOP |
| 标准包装： | 1 |
| 功能： | 电池监控器 |
| 电池化学： | 多化学 |
| 电源电压： | 2.8 V ~ 4.5 V |
| 工作温度： | -20°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 1020 (CN2011-ZH PDF) |
| 其它名称： | 296-17161-6 |
bq26221
SLUS607 ? MAY 2004
APPLICATION INFORMATION
battery voltage measurement
The bq26221 senses the battery voltage on the BAT pin and reports it through register pair BATH?BATL. The
BATH (address = 0x72 – bits 0 through 2) and the BATL low-byte register (address = 0x71) contain the result
of ADC conversion on the battery voltage. The voltage is expressed in an 11-bit binary format with an LSB step
size of 2.44 mV. Bit 2 of BATH register represents the MSB and bit 0 of the BATL represent the LSB. The
full-scale voltage for this measurement is 5 V and is optimized for direct sensing in single-cell Li-Ion or Li-pol
applications (see Figure 3).
Note that Bits 3 through 7 of the BATH register store the offset information for the voltage ADC. The most
significant bit is the sign-bit followed by 4 bits of offset data.
Also note that LSB gain correction factor, in μ V, is stored in address 0x79 (byte 1 of the ID ROM) in 2’s
complement. The host is responsible for applying the LSB gain correction factor and offset to the ADC
measurements.
Correct V BAT = V BAT × (2.44 + LSB correction factor) ? offset
example 1: (If real LSB = + 2.45mV and offset = +80 mV)
in address 0x79 ? 0000 1010 (in binary) 2’s complement
in BATH (0x72) ? 0101 0XXX (in binary) signed magnitude
To calculate the correct V BAT :
LSB correction factor = +10 μ V = +0.01 mV
offset = +10 × 8 mV = 80 mV
Correct V BAT (in mV) = V BAT × (2.44 + 0.01) ? 80
example 2: (If real LSB = +2.43 mV and offset = ?80 mV
in address 0x79 ? 1111 0110 (in binary), 2’s complement
in BATH (0x72) ? 1101 0XXX (in binary), signed magnitude
To calculate the correct V BAT :
LSB correction factor = ?10 μ V= ?0.01 mV
offset = ?10 × 8 mV = ?80 mV
Correct V BAT (in mV) = V BAT × (2.44 ? 0.01) ? (?80)
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| BQ26221PWRG4 | 功能描述:电池管理 Hi-Performance Batt Monitor IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| BQ26230PW | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| BQ26231 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LOW COST BATTERY COULOMB COUNTER FOR EMBEDDED PORTABLE APPLICATIONS |
| BQ26231EVM-001 | 功能描述:电源管理IC开发工具 BQ26231 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| BQ26231PW | 功能描述:电池管理 Cost-Efficient Coulomb Counter RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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