TCN75AVUA Microchip Technology, TCN75AVUA Datasheet - Page 11

• Manufacturer Part Number: TCN75AVUA
• Description: IC TEMP SENSOR SRL 2.7V 8SMOP
• Manufacturer: Microchip Technology

Specifications of TCN75AVUA

• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Output Type: I²C™
• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Temperature Threshold: Programmable
• Full Temp Accuracy: 3 C
• Digital Output - Bus Interface: 2-Wire, I2C
• Digital Output - Number Of Bits: 9 bit to 12 bit
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Supply Current: 500 uA
• Ic Output Type: Voltage
• Sensing Accuracy Range: ± 1°C
• Temperature Sensing Range: -40°C To +125°C
• Supply Voltage Range: 2.7V To 5.5V
• Resolution (bits): 12bit
• Rohs Compliant: Yes
• Sensor Case Style: MSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

4.0
4.1
The TCN75A serial clock input (SCL) and the
bidirectional serial data line (SDA) form a 2-wire
bidirectional SMBus/Standard mode I
communication port (refer to the
Pin Characteristics
Timing Specifications (Note 1)
The following bus protocol has been defined:
TABLE 4-1:
 2010 Microchip Technology Inc.
Master
Slave
Transmitter Device sending data to the bus.
Receiver
Start
Stop
Read/Write A read or write to the TCN75A
ACK
NAK
Busy
Not Busy
Data Valid
Term
SERIAL COMMUNICATION
2-Wire SMBus/Standard Mode
I
Interface
2
C™ Protocol-Compatible
The device that controls the serial bus,
typically a microcontroller.
The device addressed by the master,
such as the TCN75A.
Device receiving data from the bus.
A unique signal from master to initiate
serial interface with a slave.
A unique signal from the master to
terminate serial interface from a slave.
registers.
A receiver Acknowledges (ACK) the
reception of each byte by polling the
bus.
A receiver Not-Acknowledges (NAK) or
releases the bus to show End-of-Data
(EOD).
Communication is not possible
because the bus is in use.
The bus is in the Idle state, both SDA
and SCL remain high.
SDA must remain stable before SCL
becomes high in order for a data bit to
be considered valid. During normal
data transfers, SDA only changes state
while SCL is low.
TCN75A SERIAL BUS
PROTOCOL DESCRIPTIONS
Table and
Description
Table).
Digital Input/output
Serial Interface
2
C compatible
4.1.1
Data transfers are initiated by a Start condition (Start),
followed by a 7-bit device address and a read/write bit.
An Acknowledge (ACK) from the slave confirms the
reception of each byte. Each access must be
terminated by a Stop condition (Stop).
Repeated communication is initiated after t
This device does not support sequential register read/
write. Each register needs to be addressed using the
Register Pointer.
This device supports the Receive Protocol. The
register can be specified using the pointer for the initial
read. Each repeated read or receive begins with a Start
condition and address byte. The TCN75A retains the
previously selected register. Therefore, it outputs data
from the previously specified register (repeated pointer
specification is not necessary).
4.1.2
The bus is controlled by a master device (typically a
microcontroller) that controls the bus access and
generates the Start and Stop conditions. The TCN75A
is a slave device and does not control other devices in
the bus. Both master and slave devices can operate as
either transmitter or receiver. However, the master
device determines which mode is activated.
4.1.3
A high-to-low transition of the SDA line (while SCL is
high) is the Start condition. All data transfers must be
preceded by a Start condition from the master. If a Start
condition is generated during data transfer, the
TCN75A resets and accepts the new Start condition.
A low-to-high transition of the SDA line (while SCL is
high) signifies a Stop condition. If a Stop condition is
introduced during data transmission, the TCN75A
releases the bus. All data transfers are ended by a Stop
condition from the master.
4.1.4
Following the Start condition, the host must transmit an
8-bit address byte to the TCN75A. The address for the
TCN75A Temperature Sensor is ‘1001,A2,A1,A0’ in
binary, where the A2, A1 and A0 bits are set externally
by connecting the corresponding pins to V
GND ‘0’. The 7-bit address transmitted in the serial bit
stream must match the selected address for the
TCN75A 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
DATA TRANSFER
MASTER/SLAVE
START/STOP CONDITION
ADDRESS BYTE
4-1).
TCN75A
DS21935D-page 11
B-FREE
DD
‘1’ or
.