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PDF CAT6095 Data sheet ( Hoja de datos )
| Número de pieza | CAT6095 | |
| Descripción | Digital Output Temperature Sensor | |
| Fabricantes | ON Semiconductor | |
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CAT6095
Digital Output Temperature
Sensor
Description
The CAT6095 is a JEDEC JC42.4 compliant Temperature Sensor
designed for general purpose temperature measurements requiring a
digital output.
The CAT6095 measures temperature at least 10 times every second.
Temperature readings can be retrieved by the host via the serial
interface, and are compared to high, low and critical trigger limits
stored into internal registers. Over or under limit conditions can be
signaled on the open−drain EVENT pin.
The CAT6095 is packaged in space saving TDFN package with
exposed backside die attach pads (DAP). The exposed DAP reduces
overall thermal resistance, thus providing faster response to thermal
changes when compared to SOIC, TSSOP or SOT packages.
Features
• JEDEC JC42.4 Compliant Temperature Sensor
• Temperature Range: −40°C to +125°C
• Supply Range: 3.3 V ± 10%
• I2C / SMBus Interface
• Schmitt Triggers and Noise Suppression Filters on SCL and SDA
Inputs
• Low Power CMOS Technology
• 2 x 3 x 0.75 mm TDFN Package
• These Devices are Pb−Free and are RoHS Compliant
VCC
SCL
A2, A1, A0
SDA
CAT6095
EVENT
VSS
Figure 1. Functional Symbol
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TDFN−8
VP2 SUFFIX
CASE 511AK
PIN CONFIGURATION
A0 1
A1
A2
VSS
VCC
EVENT
SCL
SDA
(Top View)
For the location of Pin 1, please consult the
corresponding package drawing.
MARKING DIAGRAM
HMC
ALL
YM
G
HMC
A
LL
Y
M
G
= Specific Device Code
= Assembly Location Code
= Assembly Lot Number (Last Two Digits)
= Production Year (Last Digit)
= Production Month (1 − 9, O, N, D)
= Pb−Free Package
PIN FUNCTIONS
Pin Name
A0, A1, A2
SDA
SCL
EVENT
VCC
VSS
DAP
Function
Device Address Input
Serial Data Input/Output
Serial Clock Input
Open−drain Event Output
Power Supply
Ground
Backside Exposed DAP at VSS
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
© Semiconductor Components Industries, LLC, 2011
May, 2011 − Rev. 5
1
Publication Order Number:
CAT6095/D
1 page  
CAT6095
Pin Description
SCL: The Serial Clock input pin accepts the Serial Clock
generated by the Master (Host).
SDA: The Serial Data I/O pin receives input data and
transmits data stored in the internal registers. In transmit
mode, this pin is open drain. Data is acquired on the positive
edge, and is delivered on the negative edge of SCL.
A0, A1 and A2: The Address pins set the device address.
These pins have on−chip pull−down resistors.
EVENT: The open−drain EVENT pin can be programmed
to signal over/under temperature limit conditions.
Power−On Reset
The CAT6095 incorporates Power−On Reset (POR)
circuitry which monitors the supply voltage, and then resets
(initializes) the internal state machine below a POR trigger
level of approximately 2.0 V, i.e. well below the minimum
recommended VCC value.
The temperature sensor (TS) powers-up into conversion
mode. The internal state machine will operate properly
above the POR trigger level, but valid temperature readings
can be expected only after the first conversion cycle started
and completed at nominal supply voltage.
Device Interface
The CAT6095 supports I2C and SMBus data transmission
protocols. These protocols describe serial communication
between transmitters and receivers sharing a 2−wire data
bus. Data flow is controlled by a Master device, which
generates the serial clock and the START and STOP
conditions. The CAT6095 acts as a Slave device. Master and
Slave alternate as transmitter and receiver. Up to 8 CAT6095
devices may be present on the bus simultaneously, and can
be individually addressed by matching the logic state of the
address inputs A0, A1, and A2.
I2C/SMBus Protocol
The I2C/SMBus uses two ‘wires’, one for clock (SCL) and
one for data (SDA). The two wires are connected to the VCC
supply via pull−up resistors. Master and Slave devices
connect to the bus via their respective SCL and SDA pins.
The transmitting device pulls down the SDA line to
‘transmit’ a ‘0’ and releases it to ‘transmit’ a ‘1’.
Data transfer may be initiated only when the bus is not
busy (see A.C. Characteristics).
During data transfer, the SDA line must remain stable
while the SCL line is HIGH. An SDA transition while SCL
is HIGH will be interpreted as a START or STOP condition
(Figure 8).
START
The START condition precedes all commands. It consists
of a HIGH to LOW transition on SDA while SCL is HIGH.
The START acts as a ‘wake−up’ call to all Slaves. Absent a
START, a Slave will not respond to commands.
STOP
The STOP condition completes all commands. It consists
of a LOW to HIGH transition on SDA while SCL is HIGH.
The STOP tells the Slave that no more data will be written
to or read from the Slave.
Device Addressing
The Master initiates data transfer by creating a START
condition on the bus. The Master then broadcasts an 8−bit
serial Slave address. The first 4 bits of the Slave address (the
preamble) select the Temperature Sensor (TS preamble =
0011) as shown in Figure 9. The next 3 bits, A2, A1 and A0,
select one of 8 possible TS Slave devices. The last bit, R/W,
specifies whether a Read (1) or Write (0) operation is being
performed.
Acknowledge
A matching Slave address is acknowledged (ACK) by the
Slave by pulling down the SDA line during the 9th clock
cycle (Figure 10). After that, the Slave will acknowledge all
data bytes sent to the bus by the Master. When the Slave is
the transmitter, the Master will in turn acknowledge data
bytes in the 9th clock cycle. The Slave will stop transmitting
after the Master does not respond with acknowledge
(NoACK) and then issues a STOP. Bus timing is illustrated
in Figure 11.
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5 Page 
CAT6095
Table 9. HIGH LIMIT REGISTER
B15 B14
00
B7 B6
8°C 4°C
B13
0
B5
2°C
B12
Sign
B4
1°C
B11
128°C
B3
0.5°C
B10
64°C
B2
0.25°C
Table 10. LOW LIMIT REGISTER
B15 B14 B13
000
B7 B6 B5
8°C 4°C 2°C
B12
Sign
B4
1°C
B11
128°C
B3
0.5°C
B10
64°C
B2
0.25°C
Table 11. TCRIT LIMIT REGISTER
B15 B14 B13
000
B7 B6 B5
8°C 4°C 2°C
B12
Sign
B4
1°C
B11
128°C
B3
0.5°C
B10
64°C
B2
0.25°C
Table 12. TEMPERATURE DATA REGISTER
B15 B14 B13
TCRIT
HIGH
LOW
B7 B6 B5
8°C 4°C 2°C
B12
Sign
B4
1°C
B11
128°C
B3
0.5°C
16. When applicable (as defined by Capability bit TRES), unsupported bits will read as 0
Bit Description
B15 0: Temperature is below the TCRIT limit
1: Temperature is equal to or above the TCRIT limit
B14 0: Temperature is equal to or below the High limit
1: Temperature is above the High limit
B13 0: Temperature is equal to or above the Low limit
1: Temperature is below the Low limit
B10
64°C
B2
0.25°C
(Note 16)
B9
32°C
B1
0
B9
32°C
B1
0
B9
32°C
B1
0
B9
32°C
B1
0.125°C
(Note 16)
B8
16°C
B0
0
B8
16°C
B0
0
B8
16°C
B0
0
B8
16°C
B0
0.0625°C
(Note 16)
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