DS1822

17 of 21

data from the DS1822 is valid for 15

μs after the falling edge that initiated the read time slot. Therefore,

the master must release the bus and then sample the bus state within 15

μs from the start of the slot.

and by locating the master sample time during read time slots towards the end of the 15

μs period.

DETAILED MASTER READ 1 TIMING Figure 15

RECOMMENDED MASTER READ 1 TIMING Figure 16

RELATED APPLICATION NOTES

The following Application Notes can be applied to the DS1822. These notes can be obtained from the

through our faxback service at (214) 450–0441.

Application Note 27: Understanding and Using Cyclic Redundancy Checks with Dallas Semiconductor

Touch Memory Product

Application Note 55: Extending the Contact Range of Touch Memories

Application Note 74: Reading and Writing Touch Memories via Serial Interfaces

Application Note 104: Minimalist Temperature Control Demo

Application Note 106: Complex MicroLANs

Application Note 108: MicroLAN—In the Long Run

Application

Note

162:

Interfacing

the

DS18X20/DS1822

1-Wire

Temperature

Sensor

in

a

Microcontroller Environment

Sample 1-Wire subroutines that can be used in conjunction with AN74 can be downloaded from the

Dallas website or anonymous FTP Site.

GND

1-WIRE BUS

15

μs

VIH of Master

Master samples

LINE TYPE LEGEND

Bus master pulling low

Resistor pullup

GND

1-WIRE BUS

15

μs

VIH of Master

small

small

Master samples