Data Sheet

LM75A
Digital temperature sensor and thermal watchdog
Rev. 04 — 10 July 2007
Product data sheet
1. General description
The LM75A is a temperature-to-digital converter using an on-chip band gap temperature
sensor and Sigma-delta A-to-D conversion technique. The device is also a thermal
detector providing an overtemperature detection output. The LM75A contains a number of
data registers: Configuration register (Conf) to store the device settings such as device
operation mode, OS operation mode, OS polarity and OS fault queue as described in
Section 7 “Functional description”; temperature register (Temp) to store the digital temp
reading, and set-point registers (Tos and Thyst) to store programmable overtemperature
shutdown and hysteresis limits, that can be communicated by a controller via the 2-wire
serial I2C-bus interface. The device also includes an open-drain output (OS) which
becomes active when the temperature exceeds the programmed limits. There are three
selectable logic address pins so that eight devices can be connected on the same bus
without address conflict.
The LM75A can be configured for different operation conditions. It can be set in normal
mode to periodically monitor the ambient temperature, or in shutdown mode to minimize
power consumption. The OS output operates in either of two selectable modes:
OS comparator mode or OS interrupt mode. Its active state can be selected as either
HIGH or LOW. The fault queue that defines the number of consecutive faults in order to
activate the OS output is programmable as well as the set-point limits.
The temperature register always stores an 11-bit 2's complement data giving a
temperature resolution of 0.125 °C. This high temperature resolution is particularly useful
in applications of measuring precisely the thermal drift or runaway.
The device is powered-up in normal operation mode with the OS in comparator mode,
temperature threshold of 80 °C and hysteresis of 75 °C, so that it can be used as a
stand-alone thermostat with those pre-defined temperature set points.
2. Features
n Pin-for-pin replacement for industry standard LM75 and offers improved temperature
resolution of 0.125 °C and specification of a single part over power supply range from
2.8 V to 5.5 V
n Small 8-pin package types: SO8 and TSSOP8
n I2C-bus interface with up to 8 devices on the same bus
n Power supply range from 2.8 V to 5.5 V
n Temperatures range from −55 °C to +125 °C
n 11-bit ADC that offers a temperature resolution of 0.125 °C
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
n Temperature accuracy of:
u ±2 °C from −25 °C to +100 °C
u ±3 °C from −55 °C to +125 °C
n Programmable temperature threshold and hysteresis set points
n Supply current of 3.5 µA in shutdown mode for power conservation
n Stand-alone operation as thermostat at power-up
n ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115 and 1000 V CDM per JESD22-C101
n Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
3. Applications
n
n
n
n
System thermal management
Personal computers
Electronics equipment
Industrial controllers
4. Ordering information
Table 1.
Ordering information
Type number
Package
Name
Description
Version
LM75AD
SO8
plastic small outline package; 8 leads;
body width 3.9 mm
SOT96-1
LM75ADP
TSSOP8
plastic thin shrink small outline package; 8 leads;
body width 3 mm
SOT505-1
4.1 Ordering options
Table 2.
Ordering options
Type number
Topside mark
Temperature range
LM75AD
LM75A
Tamb = −55 °C to +125 °C
LM75ADP
L75A
Tamb = −55 °C to +125 °C
LM75A_4
Product data sheet
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Rev. 04 — 10 July 2007
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LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
5. Block diagram
VCC
LM75A
BIAS
REFERENCE
POINTER
REGISTER
CONFIGURATION
REGISTER
BAND GAP
TEMP SENSOR
COUNTER
TEMPERATURE
REGISTER
TIMER
TOS
REGISTER
COMPARATOR/
INTERRUPT
THYST
REGISTER
11-BIT
SIGMA-DELTA
A-to-D
CONVERTER
OSCILLATOR
POWER-ON
RESET
OS
LOGIC CONTROL AND INTERFACE
002aad029
A2
A1
A0
SCL SDA
GND
Fig 1. Block diagram
6. Pinning information
6.1 Pinning
SDA
1
8
VCC
SCL
2
7
A0
OS
3
6
SDA
1
8
VCC
SCL
2
7
A0
A1
OS
3
A2
GND
4
LM75AD
GND
5
4
LM75ADP
A1
5
A2
002aad028
002aad027
Fig 2. Pin configuration for SO8
6
Fig 3. Pin configuration for TSSOP8
6.2 Pin description
Table 3.
Pin description
Symbol
Pin
Description
SDA
1
Digital I/O. I2C-bus serial bidirectional data line; open-drain.
SCL
2
Digital input. I2C-bus serial clock input.
OS
3
Overtemp Shutdown output; open-drain.
GND
4
Ground. To be connected to the system ground.
A2
5
Digital input. User-defined address bit 2.
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
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LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
Table 3.
Pin description …continued
Symbol
Pin
Description
A1
6
Digital input. User-defined address bit 1.
A0
7
Digital input. User-defined address bit 0.
VCC
8
Power supply.
7. Functional description
7.1 General operation
The LM75A uses the on-chip band gap sensor to measure the device temperature with
the resolution of 0.125 °C and stores the 11-bit 2's complement digital data, resulted from
11-bit A-to-D conversion, into the device Temp register. This Temp register can be read at
any time by a controller on the I2C-bus. Reading temperature data does not affect the
conversion in progress during the read operation.
The device can be set to operate in either mode: normal or shutdown. In normal operation
mode, the temp-to-digital conversion is executed every 100 ms and the Temp register is
updated at the end of each conversion. In shutdown mode, the device becomes idle, data
conversion is disabled and the Temp register holds the latest result; however, the device
I2C-bus interface is still active and register write/read operation can be performed. The
device operation mode is controllable by programming bit B0 of the configuration register.
The temperature conversion is initiated when the device is powered-up or put back into
normal mode from shutdown.
In addition, at the end of each conversion in normal mode, the temperature data (or Temp)
in the Temp register is automatically compared with the overtemperature shutdown
threshold data (or Tos) stored in the Tos register, and the hysteresis data (or Thyst) stored
in the Thyst register, in order to set the state of the device OS output accordingly. The
device Tos and Thyst registers are write/read capable, and both operate with 9-bit
2's complement digital data. To match with this 9-bit operation, the Temp register uses
only the 9 MSB bits of its 11-bit data for the comparison.
The way that the OS output responds to the comparison operation depends upon the OS
operation mode selected by configuration bit B1, and the user-defined fault queue defined
by configuration bits B3 and B4.
In OS comparator mode, the OS output behaves like a thermostat. It becomes active
when the Temp exceeds the Tos, and is reset when the Temp drops below the Thyst.
Reading the device registers or putting the device into shutdown does not change the
state of the OS output. The OS output in this case can be used to control cooling fans or
thermal switches.
In OS interrupt mode, the OS output is used for thermal interruption. When the device is
powered-up, the OS output is first activated only when the Temp exceeds the Tos; then it
remains active indefinitely until being reset by a read of any register. Once the OS output
has been activated by crossing Tos and then reset, it can be activated again only when the
Temp drops below the Thyst; then again, it remains active indefinitely until being reset by a
read of any register. The OS interrupt operation would be continued in this sequence:
Tos trip, Reset, Thyst trip, Reset, Tos trip, Reset, Thyst trip, Reset, etc.
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
4 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
In both cases, comparator mode and interrupt mode, the OS output is activated only if a
number of consecutive faults, defined by the device fault queue, has been met. The fault
queue is programmable and stored in the two bits, B3 and B4, of the Configuration
register. Also, the OS output active state is selectable as HIGH or LOW by setting
accordingly the configuration register bit B2.
At power-up, the device is put into normal operation mode, the Tos is set to 80 °C, the Thyst
is set to 75 °C, the OS active state is selected LOW and the fault queue is equal to 1. The
temp reading data is not available until the first conversion is completed in about 100 ms.
The OS response to the temperature is illustrated in Figure 4.
Tos
Thyst
reading temperature limits
OS reset
OS active
OS output in comparator mode
OS reset
(1)
(1)
(1)
OS active
OS output in interrupt mode
002aad032
(1) OS is reset by either reading register. It is assumed that the fault queue is met at each Tos and
Thyst crossing point.
Fig 4. OS response to temperature
7.2 I2C-bus serial interface
The LM75A can be connected to a compatible 2-wire serial interface I2C-bus as a slave
device under the control of a controller or master device, using two device terminals, SCL
and SDA. The controller must provide the SCL clock signal and write/read data to/from the
device through the SDA terminal. Notice that if the I2C-bus common pull-up resistors have
not been installed as required for I2C-bus, then an external pull-up resistor, about 10 kΩ,
is needed for each of these two terminals. The bus communication protocols are
described in Section 7.10.
7.3 Slave address
The LM75A slave address on the I2C-bus is partially defined by the logic applied to the
device address pins A2, A1 and A0. Each of them is typically connected either to GND for
logic 0, or to VCC for logic 1. These pins represent the three LSB bits of the device 7-bit
address. The other four MSB bits of the address data are preset to ‘1001’ by hard wiring
inside the LM75A. Table 4 shows the device’s complete address and indicates that up to
LM75A_4
Product data sheet
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Rev. 04 — 10 July 2007
5 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
8 devices can be connected to the same bus without address conflict. Because the input
pins, SCL, SDA and A2 to A0, are not internally biased, it is important that they should not
be left floating in any application.
Table 4.
Address table
1 = HIGH; 0 = LOW.
MSB
LSB
1
0
0
1
A2
A1
A0
7.4 Register list
The LM75A contains four data registers beside the pointer register as listed in Table 5.
The pointer value, read/write capability and default content at power-up of the registers
are also shown in Table 5.
Table 5.
Register table
Register Pointer
name
value
R/W
POR
state
Description
Conf
01h
R/W
00h
Configuration register: contains a single 8-bit data
byte; to set the device operating condition; default = 0.
Temp
00h
read only
n/a
Temperature register: contains two 8-bit data bytes;
to store the measured Temp data.
Tos
03h
R/W
5000h
Overtemperature shutdown threshold register:
contains two 8-bit data bytes; to store the
overtemperature shutdown Tos limit; default = 80 °C.
Thyst
02h
R/W
4B00h
Hysteresis register: contains two 8-bit data bytes;
to store the hysteresis Thyst limit; default = 75 °C.
7.4.1 Pointer register
The Pointer register contains an 8-bit data byte, of which the two LSB bits represent the
pointer value of the other four registers, and the other 6 MSB bits are equal to 0, as shown
in Table 6 and Table 7. The Pointer register is not accessible to the user, but is used to
select the data register for write/read operation by including the pointer data byte in the
bus command.
Table 6.
Pointer register
B7
B6
B5
B4
B3
B2
B[1:0]
0
0
0
0
0
0
pointer value
Table 7.
Pointer value
B1
B0
Selected register
0
0
Temperature register (Temp)
0
1
Configuration register (Conf)
1
0
Hysteresis register (Thyst)
1
1
Overtemperature shutdown register (Tos)
Because the Pointer value is latched into the Pointer register when the bus command
(which includes the pointer byte) is executed, a read from the LM75A may or may not
include the pointer byte in the statement. To read again a register that has been recently
read and the pointer has been preset, the pointer byte does not have to be included. To
LM75A_4
Product data sheet
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Rev. 04 — 10 July 2007
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LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
read a register that is different from the one that has been recently read, the pointer byte
must be included. However, a write to the LM75A must always include the pointer byte in
the statement. The bus communication protocols are described in Section 7.10.
At power-up, the Pointer value is equal to 0 and the Temp register is selected; users can
then read the Temp data without specifying the pointer byte.
7.4.2 Configuration register
The Configuration register (Conf) is a write/read register and contains an 8-bit
non-complement data byte that is used to configure the device for different operation
conditions. Table 8 shows the bit assignments of this register.
Table 8.
Conf register
Legend: * = default value.
Bit
Symbol
Access Value Description
B[7:5]
reserved
R/W
B[4:3]
OS_F_QUE[1:0] R/W
B2
OS_POL
000*
reserved for manufacturer’s use; should be kept as
zeroes for normal operation
OS fault queue programming
00*
queue value = 1
01
queue value = 2
10
queue value = 4
11
queue value = 6
R/W
OS polarity selection
0*
OS active LOW
1
B1
OS active HIGH
OS_COMP_INT R/W
B0
SHUTDOWN
OS operation mode selection
0*
OS comparator
1
OS interrupt
R/W
device operation mode selection
0*
normal
1
shutdown
7.4.3 Temperature register
The Temperature register (Temp) holds the digital result of temperature measurement or
monitor at the end of each analog-to-digital conversion. This register is read-only and
contains two 8-bit data bytes consisting of one Most Significant Byte (MSByte) and one
Least Significant Byte (LSByte). However, only 11 bits of those two bytes are used to store
the Temp data in 2’s complement format with the resolution of 0.125 °C. Table 9 shows the
bit arrangement of the Temp data in the data bytes.
Table 9.
Temp register
MSByte
LSByte
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
X
LM75A_4
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LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
When reading register Temp, all 16 bits of the two data bytes (MSByte and LSByte) are
provided to the bus and must be all collected by the controller to complete the bus
operation. However, only the 11 most significant bits should be used, and the 5 least
significant bits of the LSByte are zero and should be ignored. One of the ways to calculate
the Temp value in °C from the 11-bit Temp data is:
1. If the Temp data MSByte bit D10 = 0, then the temperature is positive and Temp value
(°C) = +(Temp data) × 0.125 °C.
2. If the Temp data MSByte bit D10 = 1, then the temperature is negative and
Temp value (°C) = −(2’s complement of Temp data) × 0.125 °C.
Examples of the Temp data and value are shown in Table 10.
Table 10.
Temp register value
11-bit binary
(2’s complement)
Hexadecimal value
Decimal value
Value
011 1111 1000
3F8
1016
+127.000 °C
011 1111 0111
3F7
1015
+126.875 °C
011 1111 0001
3F1
1009
+126.125 °C
011 1110 1000
3E8
1000
+125.000 °C
000 1100 1000
0C8
200
+25.000 °C
000 0000 0001
001
1
+0.125 °C
000 0000 0000
000
0
0.000 °C
111 1111 1111
7FF
−1
−0.125 °C
111 0011 1000
738
−200
−25.000 °C
110 0100 1001
649
−439
−54.875 °C
110 0100 1000
648
−440
−55.000 °C
Obviously, for 9-bit Temp data application in replacing the industry standard LM75, just
use only 9 MSB bits of the two bytes and disregard 7 LSB of the LSByte. The 9-bit Temp
data with 0.5 °C resolution of the LM75A is defined exactly in the same way as for the
standard LM75 and it is here similar to the Tos and Thyst registers.
7.4.4 Overtemperature shutdown threshold (Tos) and hysteresis (Thyst) registers
These two registers, are write/read registers, and also called set-point registers. They are
used to store the user-defined temperature limits, called overtemperature shutdown
threshold (Tos) and hysteresis temperature (Thyst), for the device watchdog operation. At
the end of each conversion the Temp data will be compared with the data stored in these
two registers in order to set the state of the device OS output; see Section 7.1.
Each of the set-point registers contains two 8-bit data bytes consisting of one MSByte and
one LSByte the same as register Temp. However, only 9 bits of the two bytes are used to
store the set-point data in 2’s complement format with the resolution of 0.5 °C. Table 11
and Table 12 show the bit arrangement of the Tos data and Thyst data in the data bytes.
Notice that because only 9-bit data are used in the set-point registers, the device uses
only the 9 MSB of the Temp data for data comparison.
LM75A_4
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Rev. 04 — 10 July 2007
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LM75A
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Digital temperature sensor and thermal watchdog
Table 11.
Tos register
MSByte
LSByte
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
X
X
X
Table 12.
Thyst register
MSByte
LSByte
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
X
X
X
When a set-point register is read, all 16 bits are provided to the bus and must be collected
by the controller to complete the bus operation. However, only the 9 most significant bits
should be used and the 7 LSB of the LSByte are equal to zero and should be ignored.
Table 13 shows examples of the limit data and value.
Table 13.
Tos and Thyst limit data and value
11-bit binary
(2’s complement)
Hexadecimal value
Decimal value
Value
0 1111 1010
0FA
250
+125.0 °C
0 0011 0010
032
50
+25.0 °C
0 0000 0001
001
1
+0.5 °C
0 0000 0000
000
0
0.0 °C
1 1111 1111
1FF
−1
−0.5 °C
1 1100 1110
1CE
−50
−25.0 °C
1 1001 0010
192
−110
−55.0 °C
7.5 OS output and polarity
The OS output is an open-drain output and its state represents results of the device
watchdog operation as described in Section 7.1. In order to observe this output state, an
external pull-up resistor is needed. The resistor should be as large as possible, up to
200 kΩ, to minimize the Temp reading error due to internal heating by the high OS sinking
current.
The OS output active state can be selected as HIGH or LOW by programming bit B2
(OS_POL) of register Conf: setting bit OS_POL to logic 1 selects OS active HIGH and
setting bit B2 to logic 0 sets OS active LOW. At power-up, bit OS_POL is equal to logic 0
and the OS active state is LOW.
7.6 OS comparator and interrupt modes
As described in Section 7.1, the device OS output responds to the result of the
comparison between register Temp data and the programmed limits, in registers Tos and
Thyst, in different ways depending on the selected OS mode: OS comparator or
OS interrupt. The OS mode is selected by programming bit B1 (OS_COMP_INT) of
register Conf: setting bit OS_COMP_INT to logic 1 selects the OS interrupt mode, and
setting to logic 0 selects the OS comparator mode. At power-up, bit OS_COMP_INT is
equal to logic 0 and the OS comparator is selected.
LM75A_4
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LM75A
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Digital temperature sensor and thermal watchdog
The main difference between the two modes is that in OS comparator mode, the OS
output becomes active when Temp has exceeded Tos and reset when Temp has dropped
below Thyst, reading a register or putting the device into shutdown mode does not change
the state of the OS output; while in OS interrupt mode, once it has been activated either
by exceeding Tos or dropping below Thyst, the OS output will remain active indefinitely until
reading a register, then the OS output is reset.
Temperature limits Tos and Thyst must be selected so that Tos > Thyst. Otherwise, the OS
output state will be undefined.
7.7 OS fault queue
Fault queue is defined as the number of faults that must occur consecutively to activate
the OS output. It is provided to avoid false tripping due to noise. Because faults are
determined at the end of data conversions, fault queue is also defined as the number of
consecutive conversions returning a temperature trip. The value of fault queue is
selectable by programming the two bits B4 and B3 (OS_F_QUE[1:0]) in register Conf.
Notice that the programmed data and the fault queue value are not the same. Table 14
shows the one-to-one relationship between them. At power-up, fault queue data = 0 and
fault queue value = 1.
Table 14.
Fault queue table
Fault queue data
Fault queue value
OS_F_QUE[1]
OS_F_QUE[0]
Decimal
0
0
1
0
1
2
1
0
4
1
1
6
7.8 Shutdown mode
The device operation mode is selected by programming bit B0 (SHUTDOWN) of register
Conf. Setting bit SHUTDOWN to logic 1 will put the device into shutdown mode. Resetting
bit SHUTDOWN to logic 0 will return the device to normal mode.
In shutdown mode, the device draws a small current of approximately 3.5 µA and the
power dissipation is minimized; the temperature conversion stops, but the I2C-bus
interface remains active and register write/read operation can be performed. The OS
output remains unchanged.
7.9 Power-up default and power-on reset
The LM75A always powers-up in its default state with:
•
•
•
•
•
•
Normal operation mode
OS comparator mode
Tos = 80 °C
Thyst = 75 °C
OS output active state is LOW
Pointer value is logic 0
LM75A_4
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Digital temperature sensor and thermal watchdog
When the power supply voltage is dropped below the device power-on reset level of
approximately 1.9 V (POR) and then rises up again, the device will be reset to its default
condition as listed above.
7.10 Protocols for writing and reading the registers
The communication between the host and the LM75A must strictly follow the rules as
defined by the I2C-bus management. The protocols for LM75A register read/write
operations are illustrated in Figure 5 to Figure 10 together with the following definitions:
1. Before a communication, the I2C-bus must be free or not busy. It means that the SCL
and SDA lines must both be released by all devices on the bus, and they become
HIGH by the bus pull-up resistors.
2. The host must provide SCL clock pulses necessary for the communication. Data is
transferred in a sequence of 9 SCL clock pulses for every 8-bit data byte followed by
1-bit status of the acknowledgement.
3. During data transfer, except the START and STOP signals, the SDA signal must be
stable while the SCL signal is HIGH. It means that the SDA signal can be changed
only during the LOW duration of the SCL line.
4. S: START signal, initiated by the host to start a communication, the SDA goes from
HIGH to LOW while the SCL is HIGH.
5. RS: RE-START signal, same as the START signal, to start a read command that
follows a write command.
6. P: STOP signal, generated by the host to stop a communication, the SDA goes from
LOW to HIGH while the SCL is HIGH. The bus becomes free thereafter.
7. W: write bit, when the write/read bit = LOW in a write command.
8. R: read bit, when the write/read bit = HIGH in a read command.
9. A: device acknowledge bit, returned by the LM75A. It is LOW if the device works
properly and HIGH if not. The host must release the SDA line during this period in
order to give the device the control on the SDA line.
10. A’: master acknowledge bit, not returned by the device, but set by the master or host
in reading 2-byte data. During this clock period, the host must set the SDA line to
LOW in order to notify the device that the first byte has been read for the device to
provide the second byte onto the bus.
11. NA: Not Acknowledge bit. During this clock period, both the device and host release
the SDA line at the end of a data transfer, the host is then enabled to generate the
STOP signal.
12. In a write protocol, data is sent from the host to the device and the host controls the
SDA line, except during the clock period when the device sends the device
acknowledgement signal to the bus.
13. In a read protocol, data is sent to the bus by the device and the host must release the
SDA line during the time that the device is providing data onto the bus and controlling
the SDA line, except during the clock period when the master sends the master
acknowledgement signal to the bus.
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Digital temperature sensor and thermal watchdog
1
2
3
4
1
0
0
1
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
0
0
0
0
0
0
0
1
A
0
0
0
4
5
6
7
8
9
SCL
SDA
S
A2 A1 A0 W
A
device address
START
pointer byte
write
D4 D3 D2 D1 D0 A
configuration data byte
device
acknowledge
device
acknowledge
P
device
acknowledge
STOP
001aad624
Fig 5. Write configuration register (1-byte data)
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
(next)
SCL
SDA
S
1
0
0
1
A2
A1
A0 W
0
A
0
0
device address
0
0
0
0
1
A
RS (next)
pointer byte
START
device
acknowledge
1
2
3
4
5
6
7
1
0
0
1
A2
A1
RE-START
device
acknowledge
write
8
9
A0 R
A
1
2
3
4
5
6
7
8
9
SCL (cont.)
SDA (cont.)
D7 D6 D5 D4 D3 D2 D1 D0 NA
device address
P
data byte from device
STOP
master not
acknowledged
read
device
acknowledge
001aad625
Fig 6. Read configuration register including pointer byte (1-byte data)
1
2
3
4
5
6
7
1
0
0
1
A2
A1
8
9
A0 R
A
1
2
3
4
5
6
7
8
9
SCL
SDA
S
device address
START
D7 D6 D5 D4 D3 D2 D1 D0 NA
P
data byte from device
read
device
acknowledge
master not
acknowledged
STOP
001aad626
Fig 7. Read configuration register with preset pointer (1-byte data)
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
12 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL
(next)
SDA
S
1
0
0
1
A2
A1
A0
W
A
0
0
0
device address
0
0
device
acknowledge
3
4
P0
(next)
A
device
acknowledge
write
2
P1
pointer byte
START
1
0
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL (cont.)
SDA (cont.)
D7 D6 D5 D4 D3 D2 D1 D0 A
D7 D6 D5 D4 D3 D2 D1 D0
MSByte data
A
P
LSByte data
STOP
device
acknowledge
device
acknowledge
002aad036
Fig 8. Write Tos or Thyst register (2-byte data)
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
0
SCL
SDA
(next)
S
1
0
0
1
A2 A1 A0 W A
0
0
device address
START
0
0
0
0
P1 P0 A RS (next)
pointer byte
1
2
3
4
device
acknowledge
5 6 7 8
1
0
0
1
A2 A1 A0 R
RE-START
device
acknowledge
write
9
A
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL (cont)
SDA (cont)
D7 D6 D5 D4 D3 D2 D1 D0 A'
device address
D7 D6 D5 D4 D3 D2 D1 D0 NA
MSByte from device
LSByte from device
master
acknowledge
read
device
acknowledge
P
STOP
master not
acknowledged
002aad037
Fig 9. Read Temp, Tos or Thyst register including pointer byte (2-byte data)
1
2
3
4
1
0
0
1
5
6
7
8
9
A2 A1 A0 R
A
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
SCL
SDA
S
device address
START
D7 D6 D5 D4 D3 D2 D1 D0 A' D7 D6 D5 D4 D3 D2 D1 D0 NA
MSByte from device
read
device
acknowledge
master
acknowledge
P
LSByte from device
master not
acknowledged
STOP
002aad038
Fig 10. Read Temp, Tos or Thyst register with preset pointer (2-byte data)
LM75A_4
Product data sheet
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13 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
8. Application design-in information
power supply
0.1 µF
BUS
10 kΩ
PULL-UP
RESISTORS
10 kΩ
SCL
I2C-BUS
SDA
A2
DIGITAL LOGIC
10 kΩ
VCC
A1
A0
8
2
1
LM75A
3
OS
DETECTOR OR
INTERRUPT LINE
5
6
7
4
GND
002aad030
Fig 11. Typical application
9. Limiting values
Table 15. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
VCC
Conditions
Min
Max
Unit
supply voltage
−0.3
+6.0
V
voltage at input pins
−0.3
+6.0
V
current at input pins
−5.0
+5.0
mA
IO(sink)
output sink current
on pin OS
-
10.0
mA
VO
output voltage
on pin OS
−0.3
+6.0
V
Vesd
electrostatic discharge
voltage
human body model
-
2000
V
machine model
-
200
V
Tstg
storage temperature
−65
+150
°C
Tj
junction temperature
-
150
°C
10. Recommended operating conditions
Table 16.
Recommended operating characteristics
Symbol
Parameter
Min
Typ
Max
Unit
VCC
supply voltage
Conditions
2.8
-
5.5
V
Tamb
ambient temperature
−55
-
+125
°C
LM75A_4
Product data sheet
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Rev. 04 — 10 July 2007
14 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
11. Static characteristics
Table 17. Static characteristics
VCC = 2.8 V to 5.5 V; Tamb = −55 °C to +125 °C; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ[1]
Max
Unit
TACC
temperature accuracy
Tamb = −25 °C to +100 °C
−2
-
+2
°C
Tamb = −55 °C to +125 °C
−3
-
+3
°C
Tres
temperature resolution
11-bit digital temp data
-
0.125
-
°C
TCONV(T)
temperature conversion
time
normal mode
-
100
-
ms
IDD
supply current
normal mode: I2C-bus inactive
-
100
-
µA
normal mode: I2C-bus active
-
-
1.0
mA
shutdown mode
-
3.5
-
µA
0.7 × VCC
-
VCC + 0.3
V
VIH
HIGH-level input voltage
digital pins (SCL, SDA, A2 to A0)
VIL
LOW-level input voltage
digital pins
−0.3
-
0.3 × VCC
V
VIHYS
input voltage hysteresis
SCL and SDA pins
-
300
-
mV
A2, A1, A0 pins
-
150
-
mv
digital pins; VI = VCC
−1.0
-
+1.0
µA
IIH
HIGH-level input current
IIL
LOW-level input current
digital pins; VI = 0 V
−1.0
-
+1.0
µA
VOL
LOW-level output voltage
SDA and OS pins; IOL = 3 mA
-
-
0.4
V
IOL = 4 mA
-
-
0.8
V
ILO
output leakage current
SDA and OS pins; VOH = VCC
-
-
10
µA
OSQ
OS fault queue
programmable
1
-
6
Conv[2]
Tos
overtemperature
shutdown threshold
default value
-
80
-
°C
Thyst
hysteresis temperature
default value
-
75
-
°C
Ci
input capacitance
digital pins
-
20
-
pF
[1]
Typical values are at VCC = 3.3 V and Tamb = 25 °C.
[2]
“Conv” = device A-to-D conversion.
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
15 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
12. Dynamic characteristics
Table 18. I2C-bus interface dynamic characteristics[1]
VCC = 2.8 V to 5.5 V; Tamb = −55 °C to +125 °C; unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
TCLK
SCL clock period
see Figure 12
2.5
-
-
µs
tHIGH
HIGH period of the SCL clock
0.6
-
-
µs
tLOW
LOW period of the SCL clock
1.3
-
-
µs
tHD;STA
hold time (repeated) START condition
100
-
-
ns
tSU;DAT
data set-up time
100
-
-
ns
0
-
-
ns
100
-
-
ns
-
250
-
ns
[2]
tHD;DAT
data hold time
tSU;STO
set-up time for STOP condition
tf
fall time
SDA and OS outputs;
CL = 400 pF; IOL = 3 mA
[1]
These specifications are guaranteed by design and not tested in production.
[2]
The data hold time minimum value is 10 ns for the SCL clock period of 10 µs or higher.
TCLK
tHIGH
tLOW
SCL
tHD;STA
tSU;DAT
tHD;DAT
tSU;STO
SDA
002aad031
Fig 12. Timing diagram
LM75A_4
Product data sheet
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Rev. 04 — 10 July 2007
16 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
13. Package outline
SO8: plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1
D
E
A
X
c
y
HE
v M A
Z
5
8
Q
A2
A
(A 3)
A1
pin 1 index
θ
Lp
1
L
4
e
detail X
w M
bp
0
2.5
5 mm
scale
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (2)
e
HE
L
Lp
Q
v
w
y
Z (1)
mm
1.75
0.25
0.10
1.45
1.25
0.25
0.49
0.36
0.25
0.19
5.0
4.8
4.0
3.8
1.27
6.2
5.8
1.05
1.0
0.4
0.7
0.6
0.25
0.25
0.1
0.7
0.3
inches
0.069
0.010 0.057
0.004 0.049
0.01
0.019 0.0100
0.014 0.0075
0.20
0.19
0.16
0.15
0.05
0.01
0.01
0.004
0.028
0.012
0.244
0.039 0.028
0.041
0.228
0.016 0.024
θ
8o
o
0
Notes
1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.
2. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.
REFERENCES
OUTLINE
VERSION
IEC
JEDEC
SOT96-1
076E03
MS-012
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-12-27
03-02-18
Fig 13. Package outline SOT96-1 (SO8)
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
17 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
TSSOP8: plastic thin shrink small outline package; 8 leads; body width 3 mm
D
E
SOT505-1
A
X
c
y
HE
v M A
Z
5
8
A2
pin 1 index
(A3)
A1
A
θ
Lp
L
1
4
detail X
e
w M
bp
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D(1)
E(2)
e
HE
L
Lp
v
w
y
Z(1)
θ
mm
1.1
0.15
0.05
0.95
0.80
0.25
0.45
0.25
0.28
0.15
3.1
2.9
3.1
2.9
0.65
5.1
4.7
0.94
0.7
0.4
0.1
0.1
0.1
0.70
0.35
6°
0°
Notes
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
2. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
OUTLINE
VERSION
REFERENCES
IEC
JEDEC
JEITA
EUROPEAN
PROJECTION
ISSUE DATE
99-04-09
03-02-18
SOT505-1
Fig 14. Package outline SOT505-1 (TSSOP8)
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
18 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
14. Soldering
This text provides a very brief insight into a complex technology. A more in-depth account
of soldering ICs can be found in Application Note AN10365 “Surface mount reflow
soldering description”.
14.1 Introduction to soldering
Soldering is one of the most common methods through which packages are attached to
Printed Circuit Boards (PCBs), to form electrical circuits. The soldered joint provides both
the mechanical and the electrical connection. There is no single soldering method that is
ideal for all IC packages. Wave soldering is often preferred when through-hole and
Surface Mount Devices (SMDs) are mixed on one printed wiring board; however, it is not
suitable for fine pitch SMDs. Reflow soldering is ideal for the small pitches and high
densities that come with increased miniaturization.
14.2 Wave and reflow soldering
Wave soldering is a joining technology in which the joints are made by solder coming from
a standing wave of liquid solder. The wave soldering process is suitable for the following:
• Through-hole components
• Leaded or leadless SMDs, which are glued to the surface of the printed circuit board
Not all SMDs can be wave soldered. Packages with solder balls, and some leadless
packages which have solder lands underneath the body, cannot be wave soldered. Also,
leaded SMDs with leads having a pitch smaller than ~0.6 mm cannot be wave soldered,
due to an increased probability of bridging.
The reflow soldering process involves applying solder paste to a board, followed by
component placement and exposure to a temperature profile. Leaded packages,
packages with solder balls, and leadless packages are all reflow solderable.
Key characteristics in both wave and reflow soldering are:
•
•
•
•
•
•
Board specifications, including the board finish, solder masks and vias
Package footprints, including solder thieves and orientation
The moisture sensitivity level of the packages
Package placement
Inspection and repair
Lead-free soldering versus PbSn soldering
14.3 Wave soldering
Key characteristics in wave soldering are:
• Process issues, such as application of adhesive and flux, clinching of leads, board
transport, the solder wave parameters, and the time during which components are
exposed to the wave
• Solder bath specifications, including temperature and impurities
LM75A_4
Product data sheet
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Rev. 04 — 10 July 2007
19 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
14.4 Reflow soldering
Key characteristics in reflow soldering are:
• Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see Figure 15) than a PbSn process, thus
reducing the process window
• Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
• Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak
temperature is high enough for the solder to make reliable solder joints (a solder paste
characteristic). In addition, the peak temperature must be low enough that the
packages and/or boards are not damaged. The peak temperature of the package
depends on package thickness and volume and is classified in accordance with
Table 19 and 20
Table 19.
SnPb eutectic process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (°C)
Volume (mm3)
< 350
≥ 350
< 2.5
235
220
≥ 2.5
220
220
Table 20.
Lead-free process (from J-STD-020C)
Package thickness (mm)
Package reflow temperature (°C)
Volume (mm3)
< 350
350 to 2000
> 2000
< 1.6
260
260
260
1.6 to 2.5
260
250
245
> 2.5
250
245
245
Moisture sensitivity precautions, as indicated on the packing, must be respected at all
times.
Studies have shown that small packages reach higher temperatures during reflow
soldering, see Figure 15.
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
20 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
maximum peak temperature
= MSL limit, damage level
temperature
minimum peak temperature
= minimum soldering temperature
peak
temperature
time
001aac844
MSL: Moisture Sensitivity Level
Fig 15. Temperature profiles for large and small components
For further information on temperature profiles, refer to Application Note AN10365
“Surface mount reflow soldering description”.
15. Abbreviations
Table 21.
Abbreviations
Acronym
Description
A-to-D
Analog-to-Digital
CDM
Charged Device Model
ESD
ElectroStatic Discharge
HBM
Human Body Model
I2C-bus
Inter-Integrated Circuit bus
I/O
Input/Output
LSB
Lease Significant Bit
LSByte
Least Significant Byte
MM
Machine Model
MSB
Most Significant Bit
MSByte
Most Significant Byte
POR
Power-On Reset
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
21 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
16. Revision history
Table 22.
Revision history
Document ID
Release date
Data sheet status
Change notice
Supersedes
LM75A_4
20070710
Product data sheet
-
LM75A_3
Modifications:
•
The format of this data sheet has been redesigned to comply with the new identity guidelines of
NXP Semiconductors.
•
•
•
•
Legal texts have been adapted to the new company name where appropriate.
added (new) Section 4.1 “Ordering options”
added separate pin configuration drawings for SO8 and TSSOP8 (Figure 2 and Figure 3)
Table 15 “Limiting values”:
– table title changed from “Absolute maximum ratings” to Table 15 “Limiting values”
– symbol and parameter descriptions modified to new presentation standards
•
Table 18 “I2C-bus interface dynamic characteristics[1]”:
– parameter descriptions modified to new presentation standards
– added Table note 2 and its reference at tHD;DAT
LM75A_3
20060627
Product data sheet
-
LM75A_2
LM75A_2
(9397 750 14174)
20041005
Product data sheet
-
LM75A_1
LM75A_1
(9397 750 08571)
20010716
Product data
ECN 853-2266 26719
dated 16 July 2001
-
LM75A_4
Product data sheet
© NXP B.V. 2007. All rights reserved.
Rev. 04 — 10 July 2007
22 of 24
LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
17. Legal information
17.1 Data sheet status
Document status[1][2]
Product status[3]
Definition
Objective [short] data sheet
Development
This document contains data from the objective specification for product development.
Preliminary [short] data sheet
Qualification
This document contains data from the preliminary specification.
Product [short] data sheet
Production
This document contains the product specification.
[1]
Please consult the most recently issued document before initiating or completing a design.
[2]
The term ‘short data sheet’ is explained in section “Definitions”.
[3]
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
17.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
17.3 Disclaimers
General — Information in this document is believed to be accurate and
reliable. However, NXP Semiconductors does not give any representations or
warranties, expressed or implied, as to the accuracy or completeness of such
information and shall have no liability for the consequences of use of such
information.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of a NXP Semiconductors product can reasonably be expected to
result in personal injury, death or severe property or environmental damage.
NXP Semiconductors accepts no liability for inclusion and/or use of NXP
Semiconductors products in such equipment or applications and therefore
such inclusion and/or use is at the customer’s own risk.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) may cause permanent
damage to the device. Limiting values are stress ratings only and operation of
the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.
Terms and conditions of sale — NXP Semiconductors products are sold
subject to the general terms and conditions of commercial sale, as published
at http://www.nxp.com/profile/terms, including those pertaining to warranty,
intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by NXP Semiconductors. In case of
any inconsistency or conflict between information in this document and such
terms and conditions, the latter will prevail.
No offer to sell or license — Nothing in this document may be interpreted
or construed as an offer to sell products that is open for acceptance or the
grant, conveyance or implication of any license under any copyrights, patents
or other industrial or intellectual property rights.
17.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
I2C-bus — logo is a trademark of NXP B.V.
18. Contact information
For additional information, please visit: http://www.nxp.com
For sales office addresses, send an email to: [email protected]
LM75A_4
Product data sheet
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Rev. 04 — 10 July 2007
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LM75A
NXP Semiconductors
Digital temperature sensor and thermal watchdog
19. Contents
1
2
3
4
4.1
5
6
6.1
6.2
7
7.1
7.2
7.3
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.5
7.6
7.7
7.8
7.9
7.10
8
9
10
11
12
13
14
14.1
14.2
14.3
14.4
15
16
17
17.1
17.2
17.3
17.4
18
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 3
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional description . . . . . . . . . . . . . . . . . . . 4
General operation . . . . . . . . . . . . . . . . . . . . . . . 4
I2C-bus serial interface . . . . . . . . . . . . . . . . . . . 5
Slave address . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Register list . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pointer register . . . . . . . . . . . . . . . . . . . . . . . . . 6
Configuration register . . . . . . . . . . . . . . . . . . . . 7
Temperature register. . . . . . . . . . . . . . . . . . . . . 7
Overtemperature shutdown threshold (Tos)
and hysteresis (Thyst) registers . . . . . . . . . . . . 8
OS output and polarity . . . . . . . . . . . . . . . . . . . 9
OS comparator and interrupt modes . . . . . . . . 9
OS fault queue . . . . . . . . . . . . . . . . . . . . . . . . 10
Shutdown mode . . . . . . . . . . . . . . . . . . . . . . . 10
Power-up default and power-on reset . . . . . . . 10
Protocols for writing and reading the registers 11
Application design-in information . . . . . . . . . 14
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 14
Recommended operating conditions. . . . . . . 14
Static characteristics. . . . . . . . . . . . . . . . . . . . 15
Dynamic characteristics . . . . . . . . . . . . . . . . . 16
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 17
Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Introduction to soldering . . . . . . . . . . . . . . . . . 19
Wave and reflow soldering . . . . . . . . . . . . . . . 19
Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 19
Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 20
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Revision history . . . . . . . . . . . . . . . . . . . . . . . . 22
Legal information. . . . . . . . . . . . . . . . . . . . . . . 23
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 23
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Contact information. . . . . . . . . . . . . . . . . . . . . 23
19
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2007.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [email protected]
Date of release: 10 July 2007
Document identifier: LM75A_4
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