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AT73C224
5.3
5.3.1
Digital Control and Protocol
The AT73C224-x family offers a choice of devices in static mode or dynamic mode (see Table 1-
1 on page 2 ). In dynamic mode, the user can manage the chip via SPI or TWI. The selection
between SPI or TWI is done at start-up via the D4 pin (see Section 5.3.2 on page 14 ).
Static Mode
When the AT73C224-x is established in Static Mode, the digital interface signals, D1 to D4,
directly drive the enable of the four supplies. During start-up, these enable signals are driven by
the internal state machine. To ensure a safe transition between the start-up state and the estab-
lished state, a handshake protocol must be respected. This transition period is especially
important in a microcontroller environment, as the microcontroller controlling the D1-D4 signals
may require an unknown period of time to actually drive these pins.
In Static Mode, the ITB/RDY pin is configured as an input with controllable pull-up resistor. When
the internal state machine completes the supply start-up, it latches the value of ITB/RDY and
then sets the POK signal to 1. This means that start-up is accomplished. The state machine then
checks for changes on ITB/RDY. If no changes are detected, the control of the four supply chan-
nels remains with the state machine. If a change is detected the internal pullup is disconnected
and the control is passed on to D1-D4, with the assignment shown in Table 5-2 below.
Table 5-1.
D1-D4 Signal Assignment
Digital Interface Signal
D1
D2
D3
D4
Supply Enable
Enables BOOST1
Enables BUCK2
Enables LDO3
Enables LDO4
The illustrations in Figure 5-3 , Figure 5-5 and Figure 5-5 represent possible static mode
scenarios.
Figure 5-3.
Fully Static Mode
D1
D2
D3
D4
0 or 1
ITB/RDY
POK
Open or 1
Power OK
Since ITB/RDY is 1 or open (weak internal pullup), the state of each supply channel is deter-
mined by the internal state machine (Automatic Start-up sequence and default values for the
three power supplies). In this configuration, the 4th power supply is off and can not be used. D1-
D4 is not considered, but must be valid. The POK signal can be used as a global system reset.
13
6266A–PMAAC–08-Sep-08
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相关代理商/技术参数
AT73C224-F 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)
AT73C224-G 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)
AT73C224-H 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)
AT73C225J 功能描述:电池管理 Monolithic numeric 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
AT73C237 功能描述:其他电源管理 NGD : MONOLITHIC NUMERIC IC RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel
AT73C238 功能描述:电池管理 Monolithic numeric 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
AT73C239 功能描述:其他电源管理 NGD MONOLITHIC NUMERIC IC RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel
AT73C239_07 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)