DS28EA00U+T&R【PDF 12/29 页】IC THERMOMETER 1-WIRE 8-USOP

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录40

8页 9页 10页 11页 [12页]13页 14页 15页 16页

as the new PIO output state arrives in its true form at the

PIO pin. To protect the transmission against data errors,

the master must repeat the PIO output data byte in its

inverted form. Only if the transmission was error-free can

the PIO status change. The actual PIO transition to the

new state occurs with a delay of t

REH

+ x from the rising

edge of the MS bit of the inverted PIO byte, as shown in

Figure 7. The value of x is approximately 0.2祍. To

inform the master about the successful communication

of the PIO byte, the DS28EA00 transmits a confirmation

byte with the data pattern AAh. While the MS bit of the

confirmation byte is transmitted, the DS28EA00 samples

the state of the PIO pins, as shown in Figure 6, and

sends it to the master. The master can either continue

writing more data to the PIO or issue a 1-Wire reset to

end the command.

Chain [99h]

This command allows the master to put the DS28EA00

into one of the three chain states, as shown in Figure 8.

The device powers up in the chain OFF state. To transi-

tion a DS28EA00 from one state to another, the master

must send a suitable chain control byte after the Chain

command code. Only the codes 3Ch, 5Ah, and 96h

(true form) are valid, assigned to OFF, ON, and DONE,

in this sequence. This control byte is first transmitted in

its true form and then in its inverted form. If the chain

state change was successful, the master receives AAh

confirmation bytes. If the change was not successful

(control byte transmission error, invalid control byte),

the master reads 00h bytes instead.

1-Wire Digital Thermometer with

Sequence Detect and PIO

DS28EA00

Maxim Integrated

REH

+ X

PIO

MOST SIGNIFICANT 2 BITS OF INVERTED PIO OUTPUT DATA BYTE

LEAST SIGNIFICANT 2 BITS OF CONFIRMATION BYTE (AAh)

Figure 7. PIO Access Write Timing Diagram

THESE TRANSITIONS ARE PERMISSIBLE, BUT DO NOT

OCCUR DURING NORMAL OPERATION.

OFF

POWER-ON RESET (POR)

CHAIN DONE

CHAIN ON

CHAIN DONE

CHAIN OFF

OR POR

DONE

Figure 8. Chain State Transition Diagram

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式