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参数资料
| 型号： | DS2441 |
| 英文描述： | 1-Cell Li-Ion Battery Manager |
| 中文描述： | 1节锂离子电池管理器 |
| 文件页数： | 8/29页 |
| 文件大小： | 134K |
| 代理商： | DS2441 |
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DS2441
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from DQ when this bit is set, DQ must subsequently remain high to support this mode of operation. A
high-to-low transition on DQ clears the RFSH bit.
Refreshing Undervoltage Packs.
To charge severely undervoltage DS2441-based battery packs, apply a
charger to the pack and read the Status Register to check the value of the UV bit. If UV=1, set the RFSH
bit to logic 1 and pull DQ high to function as the DS2441’s power supply. The DS2441 draws power
from DQ and allows charging to occur as long as DQ remains high and no charge protection condition
arises. To periodically check whether the undervoltage condition remains, read the Status Register to
check the value of UV. (The first high-to-low transition on DQ during the Status Register read will clear
the RFSH bit. If the undervoltage condition remains, as soon as the RFSH bit is cleared the DS2441 will
return to Low Power Mode, disabling charging.) If UV is still logic 1, set RFSH to logic 1 and pull DQ
high to continue charging. Loop in this manner until UV=0. When UV is low, the DS2441 will be in its
normal operating mode and will support normal charging.
CURRENT MEASUREMENT
The DS2441 measures current flow into and out of the battery pack by measuring the voltage across sense
resistor R
SENS
connected between the PACK- terminal of the battery pack and the negative terminal of the
battery. To accomplish this, the GND pin on the DS2441 is connected to the negative terminal of the
battery and the ISENS pin is connected, through a low-pass filter, to the PACK- terminal of the pack. To
measure current, the DS2441 actually measures V
ISENS
with respect to GND. In its normal mode of
operation, the DS2441 takes current measurements continuously with no assistance from the host system.
In Low Power Mode, the DS2441 suspends current measurements.
The DS2441 measures the voltage drop across R
SENS
using a digital sampling and accumulation scheme.
The use of an external low-pass filter with a corner frequency below 2 kHz on the V
ISENS
pin is
recommended. The current is measured with a signed 11-bit (0.005C) resolution. The last completed
measurement is placed in the Current Register using a sign-extended, two’s-complement format. This
register is not updated while it is being read by the host system to ensure that only the last completed
conversion is read out. The Current Register is scaled such that a count of 200
10
corresponds to a current
of 1C. Thus, the range of current flow that can be measured is from -5.115C (discharging) to +5.115C
(charging). The sign (S) of the current measurement, indicating charge or discharge, resides in the six
most significant bits of the Current Register, as shown in Figure 4. Some example Current Register
values are shown in Table 4.
CURRENT REGISTER FORMAT
Figure 4
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
LSB
msb
(unit = 0.005C)
lsb
S
S
S
S
S
S
2
9
2
8
MSB
相关PDF资料 |
PDF描述 |
|---|---|
| DS2450 | 1-Wire Quad A/D Converter |
| DS2450S | 1-Wire Quad A/D Converter |
| DS2480 | Serial 1.Wire Line Driver |
| DS2480S | Serial 1.Wire Line Driver |
| DS2490 | USB to 1-Wire Bridge Chip |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2442 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Battery Management |
| DS245 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Octal Bus Transceiver |
| DS2450 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:1-Wire Quad A/D Converter |
| DS2450S | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| DS2450S/T&R | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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