DS1857 datasheet(21/22 Pages) MAXIM

Part #	DS1857

Description	Dual Temperature-Controlled Resistors with External Temperature Input and Monitors

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual Temperature-Controlled Resistors with

External Temperature Input and Monitors

____________________________________________________________________

21

data is transmitted on SDA by the DS1857, while

the serial clock is input on SCL. Start and stop

conditions are recognized as the beginning and

end of a serial transfer.

3)

Slave Address: Command/control byte is the first

byte received following the start condition from the

master device. The command/control byte con-

sists of a 4-bit control code. For the DS1857, this

is set as 1010 binary for read/write operations. The

next three bits of the command/control byte are

the device select bits or device address. They are

used by the master device to select which of eight

possible devices on the bus is to be accessed.

When reading or writing the DS1857, 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/con-

trol byte (R/W) defines the operation to be per-

formed. 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 DS1857 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.

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

6

7

8

9

12

8

9

3–7

Figure 5. 2-Wire Data Transfer Protocol

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