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2#
发表于 2009-11-17 14:14:38
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来自: 浙江温州 来自 浙江温州
本帖最后由 小贝花 于 2009-11-17 14:15 编辑
图来了,还有我整理的 BQ24703的资料。
ACDET: AC or adapter power detection. This input pin is used to determine the presence of the ac adapter.
When the voltage level on the ACDET pin is less than VACPRES, the bq24702/bq24703 is in sleep mode, the
PWM control is disabled, the BATDRV is driven low, and the ACDRV is driven high. This feature can be used to
automatically select battery as the system power source.
ACDRV: AC or adapter power source select output. This pin drives an external P-channel MOSFET used to
switch to the ac wall-adapter as the system power source. When the ACSEL pin is high while the voltage on the
ACDET pin is greater than VACPRES, the output ACDRV pin is driven low (VHSP). This pin is driven high (VCC)
when the ACDET is less than VACPRES.
ACN, ACP: Negative and positive differential inputs, respectively for ac-to-dc adapter current sense resistor.
ACPRES: This open-drain output pin is used to indicate the presence of ac power. A logic high indicates there is
a valid ac input. A low indicates the loss of ac power. ACPRES is high when the voltage level on the ACDET pin
is greater than VACPRES.
ACSEL: AC adapter power select. This input selects either the ac adapter or the battery as the power source. A
logic high selects ac power, while a logic low selects the battery.
ACSET: Adapter current programming voltage. This input sets the system current level at which dynamic power
management occurs. Adapter currents above this programmed level activate the dynamic power management
and proportionally reduce the available power to the battery.
ALARM: Depleted battery alarm output. This open-drain pin indicates that a depleted battery condition exists. A
pullup on ALARM goes high when the voltage on the BATDEP pin is below VACPRES. On the bq24702, the
ALARM output also activates when the selector inputs do not match the selector state.
BATDEP: Depleted battery level. A voltage divider network from the battery to BATDEP pin is used to set the
battery voltage level at which depletion is indicated by the ALARM pin. See ALARM pin for more details. A
battery depletion is detected when BATDEP is less than VACPRES. A no-battery condition is detected when the
battery voltage is < 80% of the depleted threshold. In a no-battery condition, the bq24702 automatically selects
ac as the input source. If ENABLE = 1, the PWM remains enabled.
BATDRV: Battery power source select output. This pin drives an external P-channel MOSFET used to switch the
battery as the system's power source. When the voltage level on the ACDET pin is less than VACPRES, the output
of the BATDRV pin is driven low, GND. This pin is driven high (VCC) when ACSEL is high and ACDET > VACPRES.
BATP: Battery charge regulation voltage measurement input to the battery-voltage gm amplifier. The voltage on
this pin is typically derived from a voltage divider network connected across the battery. In a voltage loop, BATP
is regulated to the VFB precision reference of the battery voltage gm amplifier.
BATSET: An external override to an internal precision reference. When BATSET is > 0.25 V, the voltage level on
the BATSET pin sets the voltage charge level. When BATSET ≤ 0.25 V, an internal VFB reference is connected
to the inverting input of the battery error amplifier. To ensure proper battery voltage regulation with BATSET,
BATSET must be > 1.0 V. Simply ground BATSET to use the internal reference.
COMP: The inverting input to the PWM comparator and output of the gm amplifiers. A type II compensation
network between COMP and GND is recommended.
ENABLE: Charge enable. A high on this input pin allows PWM control operation to enable charging while a low
on this pin disables and forces the PWM output to a high state. Battery charging is initiated by asserting a logic 1
on the ENABLE pin.
GND: Supply return and ground reference
IBAT: Battery current differential amplifier output. The output of this pin produces a voltage proportional to the
battery charge current. This voltage is suitable for driving an ADC input.
PWM: Gate drive output pin drives the P-channel MOSFET for PWM control. The PWM control is active when
ACPRES, ACSEL, and ENABLE are high. PWM is driven low to VHSP and high to VCC.
SRN, SRP: Differential amplifier inputs for battery current sense. These pins feed back the battery charge current
for PWM control. SRN is tied to the battery terminal. SRP is the source pin for zero volt operation.
SRSET: Battery charge current programmed voltage. The level on this pin sets the battery charge current limit.
VCC: Operational supply voltage.
VHSP: The VHSP pin is connected to a 1-μF capacitor (close to the pin) to provide a stable voltage source to
drive the gates of the external MOSFETs. VHSP = VCC – 10 V for VCC > 10.5 V and VHSP = VCC – 0.5 V for
VCC <10.5 V. A 13-V Zener diode should be placed between VCC and VHSP to prevent MOSFET overstress
during start-up.
VREF: Bypassed precision voltage 5-V output. It can be used to set fixed levels on the inverting inputs of any
one of the three error amplifiers if desired. The tight tolerance is suitable for charging lithium-ion batteries.
VS: System (Load) voltage input pin. The voltage on this pin indicates the system voltage in order to insure a
break before make transition when changing from ac power to battery power. The battery is protected from an
over-voltage condition by disabling the P-channel MOSFET connected to the BATDRV pin if the voltage at VS is
greater than BATP. This function can be eliminated by grounding the VS pin.
ACDET:AC或适配器电源检测。这个输入引脚用于确定AC适配器。
当上ACDET引脚的电压水平比VACPRES少,bq24702/bq24703是在睡眠模式下,
PWM控制被禁用,BATDRV驱动低,ACDRV驱动高。此功能可用于
自动选择电池作为系统电源。
ACDRV:交流适配器电源选择输出。该引脚驱动外部P沟道MOSFET使用
切换到交流电源适配器作为系统的电源。当ACSEL引脚为高,而对电压
ACDET销大于VACPRES,输出ACDRV引脚置低(VHSP)。该引脚驱动的高业务(VCC)
当ACDET小于VACPRES。
乙腈,非加太:消极和积极的差分输入,分别交流到直流适配器的电流检测电阻。
ACPRES:此开漏输出引脚用于指示的交流电源的存在。逻辑高电平表示有
输入一个有效的交流。低表明了交流电源的损失。 ACPRES高时,社会上ACDET引脚电压水平
大于VACPRES。
ACSEL:交流适配器电源选择。这种输入可以选择AC适配器或作为电源电池。字母a
逻辑高电平选择AC电源,而逻辑低电平选择电池。
ACSET:适配器电流编程电压。这种输入设置系统目前的水平上的动态电源
管理发生。编程水平高于这个适配器电流激活动态电源管理
和按比例减少可用的电源与电池。
报警:电池耗尽报警输出。这种开漏引脚表明,耗尽电池的状态存在。字母a
在报警上拉高电平时,社会上BATDEP引脚电压低于VACPRES的。在bq24702的
报警输出时,也激活选择投入不匹配的选择状态。
BATDEP:耗尽电池电量。从电池电压分压器网络BATDEP引脚用于设置
电池电压层次上的损耗是由报警引脚说明。更多细节见的报警引脚。字母a
电池耗尽时,检测BATDEP比VACPRES少。无电池的情况时,发现
电池电压是“80%的贫化门槛。在没有电池条件下,bq24702自动选择
交流作为输入源。如果使能= 1,PWM的保持启用。
BATDRV:电池电源,选择输出。该引脚驱动外部P沟道MOSFET开关的使用
电池作为系统的电源。当上ACDET管脚的电压水平低于VACPRES,输出
该BATDRV引脚置低,接地。这是驱动的高脚(Vcc)与时ACSEL高,ACDET“VACPRES。
BATP:电池充电调节电压测量输入到电池电压通用放大器。在电压
该管脚通常是来自一个分压器整个电池连接的网络。在电压环,BATP
被调节电池的电压通用放大器振动流化床高精度参考。
BATSET:外部覆盖到一个内部高精度参考。当BATSET是“0.25 V时,电压级别
在BATSET引脚的电压设置收费水平。当BATSET≤0.25五,内部振动流化床参考连接
对电池的误差放大器的反相输入。为确保正确的电池电压调节与BATSET,
BATSET必须是“1.0五,简单地BATSET使用内部参考。
COMP:反相输入的PWM比较和全球机制放大器的输出。 II型补偿
COMP和接地之间的网络,建议。
启用:启用费。关于这个输入引脚高允许PWM控制操作,使充电,而低
这个引脚上禁用和部队的PWM输出到高的状态。电池充电发起断言逻辑1
ENABLE引脚上。
接地:电源和地面参考返回
伊巴特:电池电流差动放大器的输出。该引脚输出产生的电压成正比
电池的充电电流。这个电压是适合驱动ADC的输入。
脉宽调制:栅极驱动器输出引脚的P -通道MOSFET的PWM控制。 PWM控制处于活动状态时
ACPRES,ACSEL,使很高。脉宽调制驱动低到高VHSP到VCC。
干线网络,参考价:对电池电流检测差分放大器的输入。这些引脚反馈的电池充电电流
为PWM控制。主要道路网是依赖于电池的终端。 SRP的是零伏操作的源针。
SRSET:电池充电电流编程电压。该引脚级别设置电池充电电流限制。
虚拟通道连接:操作电源电压。
VHSP:该VHSP引脚连接到一个1μF的电容(接近脚),以提供稳定的电压源
驱动外部MOSFET的门。 VHSP =虚拟通道连接 - 10 V的VCC“10.5 V和VHSP =虚拟通道连接 - 0.5 V的
虚拟通道连接“10.5五,一名13 V齐纳二极管应该放在VCC和VHSP防止MOSFET的过载
在启动期间。
的VREF:旁路高精度电压5V输出。它可以用来设置的任何反相输入端固定水平
三个误差放大器1如果需要的话。紧张的宽容是适合充电锂离子电池。
队:系统(负载)电压输入引脚。该引脚电压指示系统电压,以保证一
打破之前作出的过渡,从交流电源更改为电池电量。这种电池是一种保护
过电压条件下通过禁用P沟道MOSFET连接到BATDRV脚,如果在VS电压
大于BATP。这个功能可以被淘汰的VS引脚接地。 |
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