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AT73C224
The selection between SPI versus TWI is performed once, each time the start-up sequence is
executed. A timing diagram of the interface selection is shown in Figure 5-6. Care must be taken
to leave enough time between the activation of the pullup and the moment when D4 is sampled
back. This time is necessary to load the capacitance of the net layout where D4 is connected
through the pull-up resistor (100 k ? typ.). This time is in the order of magnitude of 1 μs (10 pF *
100 k ? ), i.e. only a few cycles of the 900 kHz oscillator are needed.
Figure 5-6.
Dynamic Mode Interface Selection
Table 5-2.
Digital Interface Selection
D4
D4 pull-up control signal
dynamic
D4
D4 pull-up control signal
dynamic
SCS = Serial Chip Select
Hz
SPI selected, D4 => SCS
TWI selected
Digital Signal
SPI Selection
TWI Selection
Interface
D1
D2
D3
D4 (1)
Pad
I
BIDIR
I
I
Signal
SCK
SDO
SDI
SCS
Direction
In
Out
In
In
Signal
TWCK
TWD
Select the 7-bit
fixed address
grounded
Direction
In
I/O
In
-
Note:
5.3.2.1
1. On D4, I = Input pad with controllable pull-up resistor.
SPI Operation
When SPI mode is selected, the control interface to the AT73C224-x chip is a 4-wire interface
modeled after commonly available microcontroller and serial-peripheral devices. The interface
consists of a serial clock (SCK), chip select (SCS), serial data input (SDI) and serial data output
(SDO). Data is transferred one byte at a time with each register access consisting of a pair of
byte transfers. Figure 5-7 below illustrates read and write operations in SPI mode.
15
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)