MCP9808T-E/MS【PDF 14/52 页】IC TEMP SENSOR DGTL I2C 8MSOP

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MCP9808

DS25095A-page 14

?2011 Microchip Technology Inc.

4.1.4

ADDRESS BYTE

Following the Start condition, the host must transmit an

8-bit address byte to the MCP9808. The address for the

MCP9808 temperature sensor is 0011,A2,A1,A0 in

binary, where the A2, A1 and A0 bits are set externally

by connecting the corresponding pins to V

1 or GND

0. The 7-bit address, transmitted in the serial bit stream,

must match the selected address for the MCP9808 to

respond with an ACK. Bit 8 in the address byte is a

read/write bit. Setting this bit to 1 commands a read

operation, while 0 commands a write operation (see

Figure 4-1).

FIGURE 4-1:

Device Addressing.

4.1.5

DATA VALID

After the Start condition, each bit of data in the

transmission needs to be settled for a time specified by

SU-DATA

before SCL toggles from low-to-high (see the

Sensor Serial Interface Timing Specifications section).

4.1.6

ACKNOWLEDGE (ACK/NAK)

Each receiving device, when addressed, must

generate an ACK bit after the reception of each byte.

The master device must generate an extra clock pulse

for ACK to be recognized.

The Acknowledging device pulls down the SDA line for

SU-DATA

before the low-to-high transition of SCL from

the master. SDA also needs to remain pulled down for

H-DATA

after a high-to-low transition of SCL.

During read, the master must signal an End-of-Data

(EOD) to the slave, by not generating an ACK bit

(NAK), once the last bit has been clocked out of the

slave. In this case, the slave will leave the data line

released to enable the master to generate the Stop

condition.

4.1.7

TIME-OUT

If the SCL stays low or high for the time specified by

OUT

, the MCP9808 temperature sensor resets the

serial interface. This dictates the minimum clock speed

as outlined in the specification.

1 2 3 4 5 6 7 8 9

SCL

SDA

0 1 1 A2 A1 A0

Start

Address Byte

Slave

Address

R/W

MCP9808 Response

Code

Address

See Table 3-2.

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