DS2408 Ver la hoja de datos (PDF) - Maxim Integrated

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DS2408

1-Wire 8-Channel Addressable Switch

Maxim Integrated 

DS2408

PIO Activity Latch State Register

The data in this register represents the current state of the PIO activity latches. This register is read using

the Read PIO Registers command. Reading this register does not generate a signal at the RSTZ pin, even

if it is configured as STRB . See the Channel-access commands description for details on STRB .

PIO Activity Latch State Register Bitmap

ADDR b7

b6

b5

b4

b3

b2

b1

b0

008Ah AL7 AL6 AL5 AL4 AL3 AL2 AL1 AL0

This register is read-only. Each bit is associated with the activity latch of the respective PIO channel as

shown in Figure 6. This register is cleared to 00h by a power-on reset, by a low pulse on the RSTZ pin

(only if RSTZ is configured as RST input), or by successful execution of the Reset Activity Latches

command.

Figure 6. CHANNEL I/O AND RSTZ SIMPLIFIED LOGIC DIAGRAM

TO PIO LOGIC

STATE REGISTER

TO ACTIVITY LATCH

STATE REGISTER

POWER ON

RESET

CLR ACT LATCH

PIO ACTIVITY

LATCH "1"

QD

CHANNEL

I/O PIN

QR

EDGE

DETECTOR

TO PIO

OUTPUT LATCH

STATE REG.

DATA

DSQ

CLOCK

Q

PIO

OUTPUT

LATCH

RSTZ

PIN

PORT

FUNCTION

CONTROL

ROS

STRB

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