Rainbow-electronics DS1858 Bedienungsanleitung PDF herunterladen (Seite 21)

devices on the bus is to be accessed. When read-

ing or writing the DS1858, the device-select bits

must match one of two valid device addresses,

00h or the address registered in Table 01 location

8Ch. The last bit of the command/control byte

(R/W) defines the operation to be performed.

When set to a ‘1’ a read operation is selected, and

when set to a ‘0’ a write operation is selected. The

slave address can be set by the EEPROM.

Following the start condition, the DS1858 monitors the

SDA bus checking the device type identifier being

transmitted. Upon receiving the 1010 control code, the

appropriate device address bits, and the read/write bit,

the slave device outputs an acknowledge signal on the

SDA line.

DS1858

Dual Temperature-Controlled Resistors with

Three Monitors

____________________________________________________________________ 21

Chip Topology

TRANSISTOR COUNT: 44149

SUBSTRATE CONNECTED TO GROUND

STOP

CONDITION

OR REPEATED

START

CONDITION

REPEATED IF MORE BYTES

ARE TRANSFERRED

ACK

START

CONDITION

ACK

ACKNOWLEDGEMENT

SIGNAL FROM RECEIVER

ACKNOWLEDGEMENT

SIGNAL FROM RECEIVER

SLAVE ADDRESS

MSB

SCL

SDA

R/W

DIRECTION

BIT

12 678 9 12 893–7

Figure 5. 2-Wire Data Transfer Protocol

1 2 ... 16 17 18 19 20 21 22

Three Monitors 1

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