参数资料
型号: MCP79401T-I/MNY
厂商: Microchip Technology
文件页数: 2/15页
文件大小: 0K
描述: IC CLK RTCC 64B EUI-48 8-TDFN
标准包装: 1
类型: 时钟/日历
特点: 警报器,闰年,方波输出,SRAM,唯一 ID
存储容量: 64B
时间格式: HH:MM:SS(12/24 小时)
数据格式: YY-MM-DD-dd
接口: I²C,2 线串口
电源电压: 1.8 V ~ 5.5 V
电压 - 电源,电池: 1.3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-WFDFN 裸露焊盘
供应商设备封装: 8-TDFN(2x3)
包装: 标准包装
其它名称: MCP79401T-I/MNYDKR
MCP7940X
DS25009C-page 10
2011 Microchip Technology Inc.
4.1.3
ACKNOWLEDGE POLLING
Since the device will not acknowledge a Unique ID
command during an ID write cycle, this can be used to
determine when the cycle is complete. This feature can
be used to maximize bus throughput. Once the Stop
condition for a Write command has been issued from
the master, the device initiates the internally timed write
cycle. ACK polling can be initiated immediately. This
involves the master sending a Start condition, followed
by the control byte for a Write command (R/W = 0). If
the device is still busy with the write cycle, then no ACK
will be returned. If no ACK is returned, then the Start bit
and control byte must be resent. If the cycle is
complete, then the device will return the ACK, and the
master can then proceed with the next Read or Write
command. See Figure 4-4 for the flow diagram.
FIGURE 4-4:
ACKNOWLEDGE
POLLING FLOW
Send
ID Write Command
Send Stop
Condition to
Initiate ID Write Cycle
Send Start
Send Control Byte
with R/W = 0
Did Device
Acknowledge
(ACK = 0)?
Next
Operation
NO
YES
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