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CAT34TS04
Digital Output Temperature
Sensor with On-board SPD
EEPROM
Description
The CAT34TS04 is a combination Temperature Sensor (TS) and
4−Kb of Serial Presence Detect (SPD) EEPROM, which implements
the JEDEC TSE2004av DDR4 specification and supports the Standard
(100 kHz), Fast (400 kHz) and Fast Plus (1 MHz) I2C protocols.
The TS 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.
One of the two available 2−Kb SPD EEPROM banks (referred to as
SPD pages in the TSE2004av specification) is activated for access at
power−up. After power−up, banks can be switched via software
command. Each of the four 1−Kb SPD EEPROM blocks can be Write
Protected by software command.
Features
•
•
•
•
•
•
•
•
•
•
JEDEC TSE2004av Compliant Temperature Sensor
Temperature Range: −20°C to +125°C
DDR4 DIMM Compliant SPD EEPROM
Supply Range: 1.7 V − 5.5 V (SPD EEPROM) and
2.2 V − 5.5 V (TS)
I2C / SMBus Interface
Schmitt Triggers and Noise Suppression Filters on SCL and SDA
Inputs
16−Byte Page Write Buffer
Low Power CMOS Technology
2 x 3 x 0.75 mm TDFN Package and 2 x 3 x 0.5 mm UDFN Package
These Devices are Pb−Free and are RoHS Compliant
VCC
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UDFN−8
HU4 SUFFIX
CASE 517AZ
TDFN−8
VP2 SUFFIX
CASE 511AK
PIN CONFIGURATION
1
A0
A1
VCC
EVENT
(Top View)
A2
SCL
SDA
VSS
TDFN (VP2), UDFN (HU4)
For the location of Pin 1, please consult the
corresponding package drawing.
MARKING DIAGRAM
TDFN−8
4TA
ALL
YM
G
4UA
ALL
YM
G
UDFN−8
4TA, 4UA = Specific Device Code
A
= Assembly Location Code
LL
= Assembly Lot Number (Last Two Digits)
Y
= Production Year (Last Digit)
M
= Production Month (1 − 9, O, N, D)
G
= Pb−Free Package
= Pin 1 Indicator
PIN FUNCTIONS
SCL
A2, A1, A0
Pin Name
CAT34TS04
A0, A1, A2
EVENT
SDA
Figure 1. Functional Symbol
Device Address Input
SDA
Serial Data Input/Output
SCL
Serial Clock Input
EVENT
VSS
Function
Open−drain Event Output
VCC
Power Supply
VSS
Ground
DAP
Backside Exposed DAP at VSS
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
© Semiconductor Components Industries, LLC, 2013
October, 2013 − Rev. 6
1
Publication Order Number:
CAT34TS04/D
CAT34TS04
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Units
Operating Temperature
−45 to +130
°C
Storage Temperature
−65 to +150
°C
Voltage on any pin (except A0) with respect to Ground (Note 1)
−0.5 to +6.5
V
Voltage on pin A0 with respect to Ground
−0.5 to +10.5
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The DC input voltage on any pin should not be lower than −0.5 V or higher than VCC + 0.5 V. The A0 pin can be raised to a HV level for SWP
command execution. SCL and SDA inputs can be raised to the maximum limit, irrespective of VCC.
Table 2. RELIABILITY CHARACTERISTICS
Symbol
Parameter
NEND (Note 2)
Endurance (EEPROM)
TDR
Min
Units
1,000,000
Write Cycles
100
Years
Data Retention (EEPROM)
2. Page Mode, VCC = 2.5 V, 25°C
Table 3. TEMPERATURE CHARACTERISTICS (VCC = 2.2 V to 3.6 V, TA = −20°C to +125°C, unless otherwise specified)
Parameter
Test Conditions/Comments
Temperature Reading Error
Max
Unit
+75°C ≤ TA ≤ +95°C, active range
±1.0
°C
+40°C ≤ TA ≤ +125°C, monitor range
±2.0
°C
−20°C ≤ TA ≤ +125°C, sensing range
±3.0
°C
12
Bits
ADC Resolution
Temperature Resolution
Conversion Time
Thermal Resistance (Note 3) qJA
Junction−to−Ambient (Still Air)
0.0625
°C
100
ms
92
°C/W
3. Power Dissipation is defined as PJ = (TJ − TA)/qJA, where TJ is the junction temperature and TA is the ambient temperature. The thermal
resistance value refers to the case of a package being used on a standard 2−layer PCB.
Table 4. D.C. OPERATING CHARACTERISTICS (VCC = 2.2 V to 3.6 V, TA = −20°C to +125°C, unless otherwise specified)
Symbol
ICC
ISHDN
Parameter
Supply Current
Test Conditions/Comments
Min
Max
Unit
TS active, SPD and Bus idle
1000
mA
SPD Write, TS shut−down
1000
mA
Standby Current
TS shut−down; SPD and Bus idle
10
mA
ILKG
I/O Pin Leakage Current
Pin at GND or VCC
2
mA
VIL
Input Low Voltage
−0.5
0.3 x VCC
V
VIH
Input High Voltage
0.7 x VCC
VCC + 0.5
V
VOL1 (Note 4)
Output Low Voltage
IOL = 3 mA, VCC > 2.2 V
0.4
V
VOL2
Output Low Voltage
IOL = 1 mA, VCC < 2.2 V
0.2
V
4. The device is able to handle RL values corresponding to the specified rise time (see Figure 2).
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2
CAT34TS04
Table 5. A.C. CHARACTERISTICS (VCC = 2.2 V to 3.6 V, TA = −20°C to +125°C)
Parameter
Min
Max
Units
Clock Frequency
0.01
1
MHz
tHIGH
High Period of SCL Clock
260
ns
tLOW
Low Period of SCL Clock
500
ns
SMBus SCL Clock Low Timeout
25
Symbol
FSCL (Note 5)
tTIMEOUT (Note 6)
35
ms
tR (Note 7)
SDA and SCL Rise Time
120
ns
tF (Note 7)
SDA and SCL Fall Time
120
ns
tSU:DAT
Input Data Setup Time
50
ns
tSU:STA
START Condition Setup Time
260
ns
tHD:STA
START Condition Hold Time
260
ns
tSU:STO
STOP Condition Setup Time
260
ns
Bus Free Time Between STOP and START
500
ns
0
ns
tBUF
tHD:DAT
Input Data Hold Time
tDH (Note 7)
Output Data Hold Time
Ti
tWR
tPU (Note 8)
120
300
ns
Noise Pulse Filtered at SCL and SDA Inputs
50
ns
Write Cycle Time
5
ms
100
ms
Power-Up Delay to Valid Temperature Recording
5. Timing reference points are set at 30%, respectively 70% of VCC, as illustrated in Figure 5. Bus loading must be such as to allow meeting
the VIL and VOL as well as all other timing requirements. The minimum clock frequency of 10 kHz is an SMBus recommendation; the minimum
operating clock frequency is limited only by the SMBus time−out. The device also meets the Fast and Standard I2C specifications, except
that Ti and tDH are shorter, as required by the 1 MHz Fast Plus protocol.
6. For the CAT34TS04, the interface will reset itself and will release the SDA line if the SCL line stays low beyond the tTIMEOUT limit. The time−out
count takes place when SCL is low in the time interval between START and STOP.
7. In a “Wired−OR” system (such as I2C or SMBus), SDA rise time is determined by bus loading. Since each bus pull−down device must be
able to sink the (external) bus pull−up current (in order to meet the VIL and/or VOL limits), it follows that SDA fall time is inherently faster than
SDA rise time. SDA rise time can exceed the standard recommended tR limit, as long as it does not exceed tLOW − tDH − tSU:DAT, where tLOW
and tDH are actual values (rather than spec limits). A shorter tDH leaves more room for a longer SDA tR, allowing for a more capacitive bus
or a larger bus pull−up resistor.
8. The first valid temperature recording can be expected after tPU at nominal supply voltage.
Table 6. PIN CAPACITANCE (TA = 25°C, VCC = 3.6 V, f = 1 MHz)
CIN
Parameter
Test Conditions/Comments
Min
Max
Unit
SDA, EVENT Pin Capacitance
VIN = 0
8
pF
Input Capacitance (other pins)
VIN = 0
6
pF
PULL−UP RESISTANCE (kW)
Symbol
VCC
10
RL
300 ns Rise Time
SDA
120 ns Rise Time
1
CL
VSS
0.1
10
100
LOAD CAPACITANCE (pF)
Figure 2. Pull−up Resistance vs. Load Capacitance
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CAT34TS04
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 SPD memory or in the TS 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 accept 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.
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 3).
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.
Power−On Reset (POR)
The CAT34TS04 incorporates Power−On Reset (POR)
circuitry which protects the device against powering up to an
undetermined logic state. As VCC exceeds the POR trigger
level, the TS component will power up into conversion
mode and the SPD component will power up into standby
mode. Both the TS and SPD components will power down
into Reset mode when VCC drops below the POR trigger
level. This bi−directional POR behavior protects the
CAT34TS04 against brown−out failure following a
temporary loss of power. The POR trigger level is set below
the minimum operating VCC level.
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) determine whether the command is intended for
the Temperature Sensor (TS) or the EEPROM. The next 3
bits, A2, A1 and A0, select one of 8 possible Slave devices.
The last bit, R/W, specifies whether a Read (1) or Write (0)
operation is being performed.
Device Interface
The CAT34TS04 supports the Inter−Integrated Circuit
(I2C) and the System Management Bus (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 CAT34TS04 acts as a Slave device. Master
and Slave alternate as transmitter and receiver. Up to 8
CAT34TS04 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.
Acknowledge
A matching Slave address is acknowledged (ACK) by the
Slave by pulling down the SDA line during the 9th clock
cycle (Figure 4). 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 5.
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
SDA
SCL
START BIT
STOP BIT
Figure 3. Start/Stop Timing
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4
CAT34TS04
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
ACKNOWLEDGE
START
Figure 4. Acknowledge Timing
tF
tHIGH
tR
70%
30%
70%
SCL
tLOW
tSU:STA
70%
30%
tHD:DAT
tHD:STA
70%
30%
SDA IN
70%
tSU:STO
tSU:DAT
70%
30%
30%
70%
70%
tBUF
tDH
70%
SDA OUT
30%
Figure 5. Bus Timing
Table 7. COMMAND SET (Notes 9, 10)
Function Specific Preamble
Select Address
R/W_n
Abbr
b7
b6
b5
b4
b3
b2
b1
b0
Read Temperature Registers
RTR
0
0
1
1
LSA2
LSA1
LSA0
1
Write Temperature Registers
WTR
Read EE Memory
RSPD
Write EE Memory
WSPD
Set Write Protection, block 0
SWP0
Set Write Protection, block 1
Function
A0 Pin
0 or 1
0
1
0
1
0
LSA2
LSA1
LSA0
0
1
1
0
0
0
1
0
VHV
SWP1
1
0
0
0
VHV
Set Write Protection, block 2
SWP2
1
0
1
0
VHV
Set Write Protection, block 3
SWP3
0
0
0
0
VHV
Clear All Write Protection
CWP
0
1
1
0
VHV
Read Protection Status, block 0
RPS0
0
0
1
1
0, 1 or VHV
Read Protection Status, block 1
RPS1
1
0
0
1
0, 1 or VHV
Read Protection Status, block 2
RPS2
1
0
1
1
0, 1 or VHV
Read Protection Status, block 3
RPS3
0
0
0
1
0, 1 or VHV
Set SPD Page Address to 0
(Select Lower Bank)
SPA0
1
1
0
0
0, 1 or VHV
Set SPD Page Address to 1
(Select Upper Bank)
SPA1
1
1
1
0
0, 1 or VHV
Read SPD Page Address
RPA
1
1
0
1
0, 1 or VHV
Reserved
1
0 or 1
0
−
All Other Encodings
9. LSAx stands for Logic State of Address pin x.
10. If VHV is not applied on the A0 pin during SWP/CWP commands, the CAT34TS04 will respond with NoACK after the 3rd byte and will not
execute the SWP/CWP instruction. During RPS/SPA/RPA commands the state of pin A0 must be stable for the duration of the sequence.
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CAT34TS04
SPD EEPROM Bank Selection
Upon power−up, the address pointers for both the
Temperature Sensor (TS) and on−board EEPROM are
initialized to 00h. The TS address pointer will thus point to
the Capability Register and the EEPROM address pointer
will point to the first location in the lower 2−Kb bank (SPD
page 0).
Only one SPD page is visible (active) at any given time.
The lower SPD page is automatically selected at power−up.
The upper SPD page can be activated (and the lower one
implicitly de−activated) by executing the SPA1 utility
command. The SPA0 utility command can then be used to
re−activate the lower SPD page without powering down.
The identity of the active SPD page can be retrieved with the
RPA command.
SPD page selection related command details are
presented in Table 9c, Table 9d, Figure 13 and Figure 14.
fashion within the 16−byte wide data buffer. The internal
Write cycle then starts following the STOP.
Write Operations
Immediate Read
Acknowledge Polling
Acknowledge polling can be used to determine if the
CAT34TS04 is busy writing to EEPROM, or is ready to
accept commands. Polling is executed by interrogating the
device with a ‘Selective Read’ command (see READ
OPERATIONS). The CAT34TS04 will not acknowledge
the Slave address as long as internal EEPROM Write is in
progress.
Delivery State
The CAT34TS04 is shipped ‘unprotected’, i.e. none of the
Software Write Protection (SWP) flags is set. The entire
memory is erased, i.e. all bytes are 0xFF.
Read Operations
A CAT34TS04 presented with a Slave address containing
a ‘1’ in the R/W position will acknowledge the Slave address
and will then start transmitting SPD data or respectively TS
register data from the current address pointer location. The
Master stops this transmission by responding with NoACK,
followed by a STOP (Figures 10a, 10b).
EEPROM Byte and TS Register Write
To write data to a TS register, or to the on−board
EEPROM, the Master creates a START condition on the bus,
and then sends out the appropriate Slave address (with the
R/W bit set to ‘0’), followed by a starting data byte address
or TS register address, followed by data. The matching
Slave will acknowledge the Slave address, EEPROM byte
address or TS register address and the data byte(s), one for
EEPROM data (Figure 6) and two for TS register data
(Figure 7). The Master then ends the session by creating a
STOP condition on the bus. The STOP completes the
(volatile) TS register update or starts the internal Write cycle
for the (non−volatile) EEPROM data (Figure 8).
Selective Read
The Read operation can be started from a specific address,
by preceding the Immediate Read sequence with a ‘data less’
Write sequence. The Master sends out a START, Slave
address and byte or register address, but rather than
following up with data (as in a Write operation), the Master
then issues another START and continuous with an
Immediate Read sequence (Figures 11a, 11b).
EEPROM Page Write
Each of the two 2−Kb banks is organized as 16 pages of
16 bytes each (not to be confused with the SPD page, which
refers to the entire 2−Kb bank). One of the 16 memory pages
is selected by the 4 most significant bits of the byte address,
while the 4 least significant bits point to the byte position
within the page. Up to 16 bytes can be written in one Write
cycle (Figure 9).
During data load, the internal byte position pointer is
automatically incremented after each data byte is loaded. If
the Master transmits more than 16 data bytes, then earlier
data will be replaced by later data in a ‘wrap−around’
BUS ACTIVITY:
MASTER
SDA LINE
SLAVE
S
T
A
R
T
SPD
SLAVE
ADDRESS
Sequential EEPROM Read
EEPROM data can be read out indefinitely, as long as the
Master responds with ACK (Figure 12). The internal address
pointer is automatically incremented after every data byte
sent to the bus. If the end of the active 2−Kb bank is reached
during continuous Read, then the address count
‘wraps−around’ to the beginning of the active 2−Kb bank,
etc. Sequential Read works with either Immediate Read or
Selective Read, the only difference being that in the latter
case the starting address is intentionally updated.
BYTE
ADDRESS
S
T
O
P
DATA
P
S
A
C
K
A
C
K
Figure 6. EEPROM Byte Write
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6
A
C
K
CAT34TS04
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
TS
SLAVE
ADDRESS
REGISTER
ADDRESS
DATA (MSB)
S
T
O
P
DATA (LSB)
P
S
A
C
K
A
C
K
A
C
K
A
C
K
SLAVE
Figure 7. Temperature Sensor Register Write
SCL
SDA
8th Bit
Byte n
ACK
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
Figure 8. EEPROM Write Cycle Timing
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
SPD
SLAVE
ADDRESS
BYTE
ADDRESS (n)
DATA n
S
T
O
P
DATA n+P
DATA n+1
S
P
A
C
K
SLAVE
A
C
K
A
C
K
A
C
K
NOTE: In this example n = XXXX 0000(B); X = 1 or 0
Figure 9. EEPROM Page Write
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
N
OS
AT
CO
KP
SPD
SLAVE
ADDRESS
P
S
A
C
K
SLAVE
DATA
Figure 10a. EEPROM Immediate Read
BUS ACTIVITY:
MASTER
SDA LINE
SLAVE
S
T
A
R
T
TS
SLAVE
ADDRESS
N
OS
AT
CO
KP
A
C
K
P
S
A
C
K
DATA (MSB)
DATA (LSB)
Figure 10b. Temperature Sensor Immediate Read
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A
C
K
CAT34TS04
BUS ACTIVITY:
MASTER
S
T
A
R
T
SDA LINE
SPD
SLAVE
ADDRESS
S
T
A
R
T
BYTE
ADDRESS (n)
N
OS
AT
CO
KP
SLAVE
ADDRESS
P
S
S
A
C
K
SLAVE
A
C
K
A
C
K
DATA n
Figure 11a. EEPROM Selective Read
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
TS
SLAVE
ADDRESS
S
T
A
R
T
REGISTER
ADDRESS
N
OS
AT
CO
KP
A
C
K
SLAVE
ADDRESS
P
S
S
A
C
K
SLAVE
A
C
K
A
C
K
DATA (MSB)
DATA (LSB)
Figure 11b. Temperature Sensor Selective Read
BUS ACTIVITY:
MASTER
SPD
SLAVE
ADDRESS
A
C
K
A
C
K
A
C
K
N
OS
A T
CO
KP
SDA LINE
SLAVE
P
A
C
K
DATA n
DATA n+2
DATA n+1
DATA n+x
Figure 12. EEPROM Sequential Read
Software Write Protection
Each 1−Kb memory block can be individually protected
against Write requests. Block identities are:
pin A0 before the START and maintained just beyond the
STOP. The D.C. OPERATING CONDITIONS for SWP
operations are shown in Table 8.
SWP command details are listed in Tables 9a and 9b.
SWP Slave addresses follow the standard I2C convention,
i.e. to read the state of a SWP flag, the LSB of the Slave
address must be ‘1’, and to set or clear a flag, it must be ‘0’.
For Set/Clear commands a dummy byte address and dummy
data byte must be provided (Figure 13). In contrast to a
regular memory Read, a SWP Read does not return data.
Instead the CAT34TS04 will respond with NoACK if the
flag is set and with ACK if the flag is not set (Figure 14).
Block 0: byte address 0x00...0x7F (SPD page address = 0)
Block 1: byte address 0x80...0xFF (SPD page address = 0)
Block 2: byte address 0x00...0x7F (SPD page address = 1)
Block 3: byte address 0x80...0xFF (SPD page address = 1)
Block Software Write Protection (SWP) flags can be set
or cleared in the presence of a very high voltage VHV on
address pin A0. The VHV condition must be established on
Table 8. SWPn AND CWP D.C. OPERATION CONDITION
Symbol
Parameter
DVHV
A0 Overdrive (VHV − VCC)
IHVD
A0 High Voltage Detector Current
VHV
A0 Very High Voltage
Test Conditions
Min
Max
4.8
1.7 V < VCC < 3.6 V
7
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8
Units
V
0.1
mA
10
V
CAT34TS04
Table 9a. SWP SET COMMAND DETAIL (following Slave Address)
Command
Block(x)
Protection
Slave
Response
Address
Byte
Slave
Response
Data Byte
Slave
Response
Write
Cycle
SWPx(Note 11)
Not Set
ACK
(Dummy)
ACK
(Dummy)
ACK
Yes
Set
NoACK
(Dummy)
NoACK
(Dummy)
NoACK
No
X
ACK
(Dummy)
ACK
(Dummy)
ACK
Yes
CWP
Table 9b. SWP QUERRY COMMAND DETAIL (following Slave Address)
Command
Block(x)
Protection
Slave
Response
Data Byte
Master
(Response)
Data Byte
Master
(Response)
RPSx (Nots 11, 12)
Not Set
ACK
Dummy
(NoACK)
Dummy
(NoACK)
Set
NoACK
Dummy
(NoACK)
Dummy
(NoACK)
Table 9c. SPD PAGE SELECT COMMAND DETAIL (following Slave Address)
Command
SPD Active
Page
Slave
Response
Address
Byte
Slave
Response
Data Byte
Slave
Response
Write
Cycle
SPAx (Notes 13, 14)
X
ACK
(Dummy)
ACK
(Dummy)
NoACK
No
Table 9d. SPD ACTIVE PAGE QUERRY COMMAND DETAIL (following Slave Address)
Command
RPA (Notes 11, 12,
15)
SPD Active
Page
Slave
Response
Data Byte
Master
(Response)
Data Byte
Master
(Response)
0
ACK
Dummy
(NoACK)
Dummy
(NoACK)
1
NoACK
Dummy
(NoACK)
Dummy
(NoACK)
11. The Master can terminate the sequence by issuing a STOP once the CAT34TS04 responds with NoACK
12. The Master can terminate the sequence by responding with (NoACK) followed by STOP after any dummy data byte.
13. Setting the SPD Page Address to ‘0’ selects the lower 2−Kb EEPROM bank, setting it to ‘1’ selects the upper 2−Kb EEPROM bank.
14. The lower 2−Kb EEPROM bank (corresponding to SPD page address ‘0’) is active (visible) immediately following power−up.
15. The device will respond with ACK when the lower 2−Kb EEPROM bank is active and with NoACK when the upper 2−Kb EEPROM bank is
active.
BUS ACTIVITY: S
T
A
MASTER R
T
Dummy
ADDRESS
SLAVE
ADDRESS
Dummy
DATA
S
T
O
P
SDA LINE
SLAVE
N
A
C or O
A
K
C
K
X = Don’t Care
N
A
C or O
A
K
C
K
N
A
C or O
A
K
C
K
Figure 13. SWP & SPA Timing
BUS ACTIVITY: S
T
A
MASTER R
T
N
O
A
C
K
SLAVE
ADDRESS
N
OS
AT
CO
KP
SDA LINE
SLAVE
X = Don’t Care
N
A
C or O
A
K
C
K
Dummy
DATA
Dummy
DATA
Figure 14. RPS & RPA Timing
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9
CAT34TS04
Registers
The CAT34TS04 contains eight 16−bit wide registers
allocated to TS functions, as shown in Table 10. Upon
power−up, the internal address counter points to the
capability register.
Temperature Sensor Operation
The TS component in the CAT34TS04 combines a
Proportional to Absolute Temperature (PTAT) sensor with
a S−D modulator, yielding a 12 bit plus sign digital
temperature representation.
The TS runs on an internal clock, and starts a new
conversion cycle at least every 100 ms. The result of the
most recent conversion is stored in the Temperature Data
Register (TDR), and remains there following a TS
Shut−Down. Reading from the TDR does not interfere with
the conversion cycle.
The value stored in the TDR is compared against limits
stored in the High Limit Register (HLR), the Low Limit
Register (LLR) and/or Critical Temperature Register
(CTR). If the measured value is outside the alarm limits or
above the critical limit, then the EVENT pin may be
asserted. The EVENT output function is programmable, via
the Configuration Register for interrupt mode, comparator
mode and polarity.
The temperature limit registers can be Read or Written by
the host, via the serial interface. At power−on, all the
(writable) internal registers default to 0x0000, and should
therefore be initialized by the host to the desired values. The
EVENT output starts out disabled (corresponding to
polarity active low); thus preventing irrelevant event bus
activity before the limit registers are initialized. While the
TS is enabled (not shut−down), event conditions are
normally generated by a change in measured temperature as
recorded in the TDR, but limit changes can also trigger
events as soon as the new limit creates an event condition,
i.e. asynchronously with the temperature sampling activity.
In order to minimize the thermal resistance between
sensor and PCB, it is recommended that the exposed
backside die attach pad (DAP) be soldered to the PCB
ground plane.
Capability Register (User Read Only)
This register lists the capabilities of the TS, as detailed in
the corresponding bit map.
Configuration Register (Read/Write)
This register controls the various operating modes of the
TS, as detailed in the corresponding bit map.
Temperature Trip Point Registers (Read/Write)
The CAT34TS04 features 3 temperature limit registers,
the HLR, LLR and CLR mentioned earlier. The
temperature value recorded in the TDR is compared to the
various limit values, and the result is used to activate the
EVENT pin. To avoid undesirable EVENT pin activity, this
pin is automatically disabled at power−up to allow the host
to initialize the limit registers and the converter to complete
the first conversion cycle under nominal supply conditions.
Data format is two’s complement with the LSB representing
0.25°C, as detailed in the corresponding bit maps.
Temperature Data Register (User Read Only)
This register stores the measured temperature, as well as
trip status information. B15, B14, and B13 are the trip status
bits, representing the relationship between measured
temperature and the 3 limit values; these bits are not affected
by EVENT status or by Configuration register settings
regarding EVENT pin. Measured temperature is
represented by bits B12 to B0. Data format is two’s
complement, where B12 represents the sign, B11 represents
128°C, etc. and B0 represents 0.0625°C.
Manufacturer ID Register (Read Only)
The manufacturer ID assigned by the PCI−SIG trade
organization to the CAT34TS04 device is fixed at 0x1B09.
Device ID and Revision Register (Read Only)
This register contains manufacturer specific device ID
and device revision information.
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10
CAT34TS04
Table 10. THE TS REGISTERS
Register Address
Register Name
Power−On Default
Read/Write
0x00
Capability Register
0x007F
Read
0x01
Configuration Register
0x0000
Read/Write
0x02
High Limit Register
0x0000
Read/Write
0x03
Low Limit Register
0x0000
Read/Write
0x04
Critical Limit Register
0x0000
Read/Write
0x05
Temperature Data Register
Undefined
Read
0x06
Manufacturer ID Register
0x1B09
Read
0x07
Device ID/Revision Register
0x2200
Read
Table 11. CAPABILITY REGISTER
B15
B14
B13
B12
B11
B10
B9
B8
RFU
(Note 16)
RFU
RFU
RFU
RFU
RFU
RFU
RFU
B7
B6
B5
B4
B3
B2
B1
B0
EVSD
TMOUT
VHV
RANGE
ACC
EVENT
TRES [1:0]
16. RFU stands for Reserved for Future Use
Bit
B15:B8
B7 (Note 17)
Description
Reserved for future use; can not be written; should be ignored; will read as 0
0:
1:
Configuration Register bit 4 is frozen upon Configuration Register bit 8 being set
(i.e. a TS shut−down freezes the EVENT output)
Configuration Register bit 4 is cleared upon Configuration Register bit 8 being set
(i.e. a TS shut−down de−asserts the EVENT output)
B6
0:
1:
Not used
The TS implements SMBus time−out within the range 25 to 35 ms
B5
0:
1:
Not used
Defined for compatibility with CAT34TS02 device (VHV is supported)
B4:B3
00:
01:
10:
11:
LSB = 0.50°C (9 bit resolution)
LSB = 0.25°C (10 bit)
LSB = 0.125°C (11 bit)
LSB = 0.0625°C (12 bit)
B2
0:
1:
Not used
The temperature monitor can read temperatures below 0°C and sets the sign bit appropriately
B1
0:
1:
Not used
The temperature monitor has ±1°C accuracy over the active range (75°C to 95°C) and ±2°C
accuracy over the monitoring range (40°C to 125°C)
B0
0:
1:
Not used
The device supports interrupt capabilities
17. Configuration Register bit 4 can be cleared (but not set) after Configuration Register bit 8 is set, by writing a “1” to Configuration Register
bit 5 (EVENT output can be de−asserted during TS shut−down periods)
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11
CAT34TS04
Table 12. CONFIGURATION REGISTER
B15
B14
B13
B12
B11
RFU
RFU
RFU
RFU
RFU
B7
B6
B5
B4
B3
B2
B1
B0
TCRIT_LOCK
ALARM_LOCK
CLEAR
EVENT_STS
EVENT_CTRL
TCRIT_ONLY
EVENT_POL
EVENT_MODE
Bit
B15:B11
B10
B9
B8
HYST [1:0]
SHDN
Description
Reserved for future use; can not be written; should be ignored; will read as 0
B10:B9 (Note 18)
00:
01:
10:
11:
Disable hysteresis
Set hysteresis at 1.5°C
Set hysteresis at 3°C
Set hysteresis at 6°C
B8 (Note 22)
0:
1:
Thermal Sensor is enabled; temperature readings are updated at sampling rate
Thermal Sensor is shut down; temperature reading is frozen to value recorded before SHDN
B7 (Note 21)
0:
1:
Critical trip register can be updated
Critical trip register cannot be modified; this bit can be cleared only at POR
B6 (Note 21)
0:
1:
Alarm trip registers can be updated
Alarm trip registers cannot be modified; this bit can be cleared only at POR
B5 (Note 20)
0:
1:
Always reads as 0 (self−clearing)
Writing a 1 to this position clears an event recording in interrupt mode only
B4 (Note 19)
0:
1:
EVENT output pin is not being asserted
EVENT output pin is being asserted
B3 (Note 18)
0:
1:
EVENT output disabled; polarity dependent: open−drain for B1 = 0; grounded for B1 = 1
EVENT output enabled
B2 (Note 24)
0:
1:
event condition triggered by alarm or critical temperature limit crossing
event condition triggered by critical temperature limit crossing only
B1 (Notes 18, 23)
0:
1:
EVENT output active low
EVENT output active high
B0 (Note 18)
0:
1:
Comparator mode
Interrupt mode
18. Can not be altered (set or cleared) as long as either one of the two lock bits, B6 or B7 is set.
19. This bit is a polarity independent ‘software’ copy of the EVENT pin, i.e. it is under the control of B3. This bit is read−only.
20. Writing a ‘1’ to this bit clears an event condition in Interrupt mode, but has no effect in comparator mode. When read, this bit always returns
0. Once the measured temperature exceeds the critical limit, setting this bit has no effect (see Figure 15).
21. Cleared at power−on reset (POR). Once set, this bit can only be cleared by a POR condition.
22. The TS powers up into active mode, i.e. this bit is cleared at power−on reset (POR). When the TS is shut down the ADC is disabled and the
temperature reading is frozen to the most recently recorded value. The TS can not be shut down (B8 can not be set) as long as either one
of the two lock bits, B6 or B7 is set. However, the bit can be cleared at any time.
23. The EVENT output is “open−drain” and requires an external pull−up resistor for either polarity. The “natural” polarity is “active low”, as it allows
“wired−or” operation on the EVENT bus.
24. Can not be set as long as lock bit B6 is set.
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12
CAT34TS04
Table 13. HIGH LIMIT REGISTER
B15
B14
B13
B12
B11
B10
B9
B8
0
0
0
Sign
128°C
64°C
32°C
16°C
B7
B6
B5
B4
B3
B2
B1
B0
8°C
4°C
2°C
1°C
0.5°C
0.25°C
0
0
Table 14. LOW LIMIT REGISTER
B15
B14
B13
B12
B11
B10
B9
B8
0
0
0
Sign
128°C
64°C
32°C
16°C
B7
B6
B5
B4
B3
B2
B1
B0
8°C
4°C
2°C
1°C
0.5°C
0.25°C
0
0
Table 15. TCRIT LIMIT REGISTER
B15
B14
B13
B12
B11
B10
B9
B8
0
0
0
Sign
128°C
64°C
32°C
16°C
B7
B6
B5
B4
B3
B2
B1
B0
8°C
4°C
2°C
1°C
0.5°C
0.25°C
0
0
Table 16. TEMPERATURE DATA REGISTER
B15
B14
B13
B12
B11
B10
B9
B8
TCRIT
HIGH
LOW
Sign
128°C
64°C
32°C
16°C
B7
B6
B5
B4
B3
B2
B1
B0
8°C
4°C
2°C
1°C
0.5°C
0.25°C
(Note 25)
0.125°C
(Note 25)
0.0625°C
(Note 25)
25. When supported − as defined by Capability Register bits TRES (1:0); 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
B12
0: Positive temperature
1: Negative temperature
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13
CAT34TS04
Register Data Format
Event Pin Functionality
The values used in the temperature data register and the 3
temperature trip point registers are expressed in two’s
complement format. The measured temperature value is
expressed with 12−bit resolution, while the 3 trip
temperature limits are set with 10−bit resolution. The total
temperature range is arbitrarily defined as 256°C, thus
yielding an LSB of 0.0625°C for the measured temperature
and 0.25°C for the 3 limit values. Bit B12 in all temperature
registers represents the sign, with a ‘0’ indicating a positive,
and a ‘1’ a negative value. In two’s complement format,
negative values are obtained by complementing their
positive counterpart and adding a ‘1’, so that the sum of
opposite signed numbers, but of equal absolute value, adds
up to zero.
Note that trailing ‘0’ bits, are ‘0’ irrespective of polarity.
Therefore the don’t care bits (B1 and B0) in the 10−bit
resolution temperature limit registers, are always ‘0’.
The EVENT output reacts to temperature changes as
illustrated in Figure 15, and according to the operating mode
defined by the Configuration register.
In Interrupt Mode, the (enabled) EVENT output will be
asserted every time the temperature crosses one of the alarm
window limits, and can be de−asserted by writing a ‘1’ to the
clear event bit (B5) in the configuration register. Once the
temperature exceeds the critical limit, the EVENT remains
asserted as long as the temperature stays above the critical
limit and cannot be cleared. A clear request sent to the
CAT34TS04 while the temperature is above the critical limit
will be acknowledged, but will be executed only after the
temperature drops below the critical limit.
In Comparator Mode, the EVENT output is asserted
outside the alarm window limits, while in Critical
Temperature Mode, EVENT is asserted only above the
critical limit. Clear requests are ignored in this mode. The
exact trip limits are determined by the 3 temperature limit
settings and the hysteresis offsets, as illustrated in Figure 16.
Following a TS shut−down request, the converter is
stopped and the most recently recorded temperature value
present in the TDR is frozen; the EVENT output will continue
to reflect the state immediately preceding the shut−down
command. Therefore, if the state of the EVENT output
creates an undesirable bus condition, appropriate action must
be taken either before or after shutting down the TS. This may
require clearing the event, disabling the EVENT output or
perhaps changing the EVENT output polarity.
In normal use, events are triggered by a change in
recorded temperature, but the CAT34TS04 will also respond
to limit register changes. Whereas recorded temperature
values are updated at sampling rate frequency, limits can be
modified at any time. The enabled EVENT output will react
to limit changes as soon as the respective registers are
updated. This feature may be useful during testing.
Table 17. 12−BIT TEMPERATURE DATA FORMAT
Binary (B12 to B0)
Hex
Temperature
1 1100 1001 0000
1C90
−55°C
1 1100 1110 0000
1CE0
−50°C
1 1110 0111 0000
1E70
−25°C
1 1111 1111 1111
1FFF
−0.0625°C
0 0000 0000 0000
000
0°C
0 0000 0000 0001
001
+0.0625°C
0 0001 1001 0000
190
+25°C
0 0011 0010 0000
320
+50°C
0 0111 1101 0000
7D0
+125°C
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14
CAT34TS04
TEMPERATURE
CRITICAL
HYSTERESIS AFFECTS
THESE TRIP POINTS
UPPER
ALARM
WINDOW
LOWER
TIME
EVENT in “INTERRUPT” Mode
EVENT in “INTERRUPT” Mode
EVENT in “INTERRUPT” Mode
EVENT in “COMPARATOR” Mode
EVENT in “CRITICAL TEMP ONLY” Mode
Clear request executed immediately
Clear request acknowledged but execution delayed until measured temperature drops below the active Critical Temperature limit
Figure 15. Event Detail
TH
TH − HYST
TL
TL − HYST
BELOW
WINDOW BIT
ABOVE
WINDOW BIT
Figure 16. Hysteresis Detail
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15
CAT34TS04
PACKAGE DIMENSIONS
TDFN8, 2x3
CASE 511AK−01
ISSUE A
D
A
e
b
E2
E
PIN#1
IDENTIFICATION
A1
PIN#1 INDEX AREA
D2
TOP VIEW
SIDE VIEW
SYMBOL
MIN
NOM
MAX
A
0.70
0.75
0.80
A1
0.00
0.02
0.05
A2
0.45
0.55
0.65
A3
A2
A3
0.20
0.25
0.30
D
1.90
2.00
2.10
D2
1.30
1.40
1.50
E
2.90
3.00
3.10
E2
1.20
1.30
1.40
L
BOTTOM VIEW
0.20 REF
b
e
FRONT VIEW
0.50 TYP
0.20
0.30
L
0.40
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-229.
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16
CAT34TS04
PACKAGE DIMENSIONS
UDFN8, 2x3 EXTENDED PAD
CASE 517AZ−01
ISSUE O
D
b
A
e
L
DAP SIZE 1.8 x 1.8
E2
E
PIN #1
IDENTIFICATION
A1
PIN #1 INDEX AREA
D2
TOP VIEW
SYMBOL
MIN
SIDE VIEW
NOM
MAX
A
0.45
0.50
0.55
A1
0.00
0.02
0.05
A3
0.127 REF
b
0.20
0.25
0.30
D
1.95
2.00
2.05
D2
1.35
1.40
1.45
E
2.95
3.00
3.05
E2
1.25
1.30
1.35
e
L
BOTTOM VIEW
DETAIL A
0.065 REF
A3 A
FRONT VIEW
0.50 REF
0.25
0.30
0.35
A3
Notes:
(1) All dimensions are in millimeters.
(2) Refer JEDEC MO-236/MO-252.
0.0 - 0.05
DETAIL A
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17
0.065 REF
Copper Exposed
CAT34TS04
Example of Ordering Information
Specific
Device Marking
Package Type
Lead
Finish
CAT34TS04VP2GT4A
4TA
TDFN−8
NiPdAu
Tape & Reel,
4,000 Units / Reel
A
CAT34TS04HU4GT4A
4UA
UDFN−8
NiPdAu
Tape & Reel,
4,000 Units / Reel
A
Device Order Number
Shipping
Device
Revision
26. All packages are RoHS−compliant (Lead−free, Halogen−free)
27. The standard lead finish is NiPdAu.
28. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
ON Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks,
copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC
reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without
limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC
does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for
surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where
personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and
its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly,
any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture
of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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