1°C Triple Temperature Sensor with Resistance Error Correction & Hotter of Two Zones

Datasheet

Revision 1.44 (04-14-08)

10

SMSC EMC1053

DATASHEET

2.3.3

Send Byte

The Send Byte protocol is used to set the Internal Address Register to the correct Address as shown

in Table 2.5. The Send Byte can be followed by the Receive Byte protocol described in Table 2.6 to

read data from the register. The send byte protocol cannot be used to write data - if data is to be

written to a register then the write byte protocol must be used as described in Section 2.3.1.

2.3.4

Receive Byte

The Receive Byte protocol is used to read data from a register when the internal register address

pointer is known to be at the right location (e.g. set via Send Byte). This can be used for consecutive

reads of the same register as shown in Table 2.6.

2.3.5

SMBus Timing Diagram

The Timing for the SMBus is shown in Figure 2.1.

2.4

SMBus Addresses

The EMC1053 may be ordered with one of four slave addresses as shown in Ordering Information.

Attempting to communicate with the EMC1053 SMBus interface with an invalid slave address or invalid

protocol results in no response from the device and does not affect its register contents. The EMC1053

supports stretching of the SMCLK signal by other devices on the SMBus but will not perform this

operation itself.

2.5

SMBus Timeout

The EMC1053 includes an SMBus time-out feature. Following a 25 ms period of inactivity on the

SMBus, the device will time-out and reset the SMBus interface.

17

1

18

11

7

1

1

81

1

Table 2.5 Send Byte Protocol

START

SLAVE ADDR

WR

ACK

REG. ADDR

ACK

STOP

17

1

18

11

Table 2.6 Receive Byte Protocol

START

SLAVE ADDR

RD

ACK

REG. DATA

NACK

STOP

17

1

1

81

1

Table 2.4 Read Byte Protocol