DS1123LE-100+【PDF 2/14 页】IC DELAY LINE 256TAP 16-TSSOP

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1993

1页 [2页]3页 4页 5页 6页

DS1123L

3.3V, 8-Bit, Programmable Timing Element

_____________________________________________________________________

To read the current values stored by the 3-wire

device(s), the latch must be enabled and the value of Q

must be read and then written back to D before the

being read. This can be accomplished in a couple of

different ways. If the microprocessor has an I/O pin that

is high impedance when set as an input, a feedback

resistor (generally between 1k

Ω and 10kΩ) can be

used to write the data on Q back to D as the value is

read (see Figure 5a). If the microprocessor has an

internal pullup on its I/O pins, or only offers separate

input and output pins, the value in the register can still

be read. The circuit shown in Figure 5b allows the Q

values to read by the microprocessor, which must write

the Q value to D before it can clock the bus to read the

next bit. If the Q values are read without writing them to

D (with the pullup or otherwise), the read is destructive.

A destructive read cycle likely results in an undesirable

change in the delay setting.

Figure 5c shows how to cascade multiple DS1123L’s

onto the same 3-wire bus. One important detail of writ-

ing software for cascaded 3-wire devices is that all the

devices on the bus must be written to or read from dur-

ing each read or write cycle. Attempting to write to only

the first device (U1) would cause the data stored in U1

MICROPROCESSOR

OUTPUT

I/O PIN

CLK

RFB

MICROPROCESSOR

OUTPUT

INPUT

A) USING A FEEDBACK RESISTOR WITH AN I/O PIN FOR READING

THE DS1123L

B) USING A SEPARATE INPUT PIN TO READ THE DS1123L

MICROPROCESSOR

CLK

OUTPUT

I/O PIN

RFB

C) CASCADING MULTIPLE DS1123L'S ON A 3-WIRE BUS

VCC

CLK

P/S

DS1123L

Figure 5. Using the Serial Interface

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