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參數(shù)資料
| 型號(hào)： | DS2438Z |
| 英文描述： | Smart Battery Monitor |
| 中文描述： | 智能電池監(jiān)視器 |
| 文件頁數(shù)： | 5/29頁 |
| 文件大?。?/td> | 351K |
| 代理商： | DS2438Z |
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DS2438
5 of 29
VOLTAGE REGISTER FORMAT
Table 2
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
LSB
MSb
(unit = 10 mV)
LSb
0
0
0
0
0
0
2
9
2
8
MSB
BATTERY
VOLTAGE
0.05V
2.7V
3.6V
5V
7.2V
9.99V
10V
DIGITAL OUTPUT (Binary)
DIGITAL OUTPUT (Hex)
0000 0000 0000 0101
0000 0001 0000 1110
0000 0001 0110 1000
0000 0001 1111 0100
0000 0010 1101 0000
0000 0011 1110 0111
0000 0011 1110 1000
0005h
010Eh
0168h
01F4h
02D0h
03E7h
03E8H
For applications requiring a general purpose voltage A/D converter, the DS2438 can be configured so that
the result of a Convert V command will place the scaled binary representation of the voltage on the V
AD
input (as opposed to the V
DD
input) into the Voltage Register in the same format described in Table 2.
Depending upon the state of the Status/Configuration Register, either (but not both) the V
DD
or V
AD
voltage will be stored in the Voltage Register upon receipt of the Convert V command. Refer to the
description of the Status/Configuration Register in the Memory Map section for details. If the V
AD
input
is used as the voltage input, the A/D will be accurate for 1.5V < V
AD
< 2V
DD
over the range 2.4V < V
DD
<
5.0V. This feature gives the user the ability to have a voltage A/D that meets spec accuracy for inputs
over the entire range of 1.5V < V
AD
< 10V for V
DD
= 5.0V.
OPERATION - MEASURING BATTERY CURRENT
The DS2438 features an A/D converter that effectively measures the current flow into and out of the
battery pack by measuring the voltage across an external sense resistor. It does so in the background at a
rate of 36.41 measurements/sec; thus, no command is required to initiate current flow measurements.
However, the DS2438 will only perform current A/D measurements if the IAD bit is set to “1” in the
Status/Configuration Register. The DS2438 measures current flow in and out of the battery through the
V
SENS
pins; the voltage from the V
SENS+
pin to the V
SENS-
pin is considered to be the voltage across the
current sense resistor, R
SENS
. The V
SENS+
terminal may be tied directly to the R
SENS
resistor, however, for
V
SENS-
, we recommend use of an RC low pass filter between it and the GND end of R
SENS
(see the block
diagram in Figure 1). Using a 100 k
=
(min) resistor (R
F
) and a 0.1
μ
F tantalum capacitor (C
F
), the filter
cutoff is approximately 15.9 Hz. The current A/D measures at a rate of 36.41 times per second, or once
every 27.46 ms. This filter will capture the effect of most current spikes, and will thus allow the current
accumulators to accurately reflect the total charge which has gone into or out of the battery.
The voltage across current sense resistor R
SENS
is measured by the ADC and the result is placed in the
Current Register in two’s complement format. The sign (S) of the result, indicating charge or discharge,
resides in the most significant bit of the Current Register, as shown in Table 3. See “Memory Map” in
Figure 7 for the Current Register address location.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2438Z/T&R | 制造商:Maxim Integrated Products 功能描述:SMART BATTERY MONITOR 8-SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MONITOR SMART BATTERY 8-SOIC |
| DS2438Z/T&R | 功能描述:IC MONITOR SMART BATTERY 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| DS2438Z+ | 功能描述:電池管理 Smart Battery Monitor RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| DS2438Z+T&R | 制造商:Maxim Integrated Products 功能描述:MONITOR MULTI-CHEM 8SOIC N - Tape and Reel 制造商:Maxim Integrated Products 功能描述:BATT MONITOR 8-SOIC T&R PBFREE 制造商:Maxim Integrated Products 功能描述:IC MONITOR SMART BATTERY 8-SOIC 制造商:Maxim Integrated Products 功能描述:Battery Management Smart Battery Monitor |
| DS2438Z+T&R | 功能描述:電池管理 Smart Battery Monitor RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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