MCP9808 MICROCHIP [Microchip Technology], MCP9808 Datasheet - Page 14

• Manufacturer Part Number: MCP9808
• Manufacturer: MICROCHIP [Microchip Technology]

operation, while ‘0’ commands a write operation (see
MCP9808
4.1.4
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
‘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
Figure
FIGURE 4-1:
DS25095A-page 14
SDA
See
SCL
Table
4-1).
Start
3-2.
ADDRESS BYTE
1 2
0
Address
Code
0
3
1 1 A2 A1 A0
Device Addressing.
Address Byte
4 5
Address
Slave
6
MCP9808 Response
7
R/W
8
DD
A
C
K
9
‘1’ or GND
4.1.5
After the Start condition, each bit of data in the
transmission needs to be settled for a time specified by
t
Sensor Serial Interface Timing Specifications
4.1.6
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
t
the master. SDA also needs to remain pulled down for
t
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
If the SCL stays low or high for the time specified by
t
serial interface. This dictates the minimum clock speed
as outlined in the specification.
SU-DATA
SU-DATA
H-DATA
OUT
, the MCP9808 temperature sensor resets the
after a high-to-low transition of SCL.
before SCL toggles from low-to-high (see the
before the low-to-high transition of SCL from
DATA VALID
ACKNOWLEDGE (ACK/NAK)
TIME-OUT
© 2011 Microchip Technology Inc.
section).