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PDF ( 数据手册 , 数据表 ) TMP124AID

零件编号 TMP124AID
描述 1.5C Accurate Programmable Digital Temperature Sensors with SPI Interface
制造商 Burr-Brown Corporation
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TMP124AID 数据手册, 描述, 功能
TMP122
TMP124
SBOS272B – JUNE 2003 – REVISED DECEMBER 2003
1.5°C Accurate Programmable
Digital Temperature Sensors
with SPI™ Interface
FEATURES
q DIGITAL OUTPUT: SPI-Compatible Interface
q PROGRAMMABLE RESOLUTION:
9- to 12-Bits + Sign
q ACCURACY:
±1.5°C from –25°C to +85°C (max)
±2.0°C from –40°C to +125°C (max)
q LOW QUIESCENT CURRENT: 50µA
q WIDE SUPPLY RANGE: 2.7V to 5.5V
q TINY SOT23-6 AND SO-8 PACKAGES
q OPERATION TO 150°C
q PROGRAMMABLE HIGH/LOW SETPOINTS
APPLICATIONS
q POWER-SUPPLY TEMPERATURE MONITORING
q COMPUTER PERIPHERAL THERMAL PROTECTION
q NOTEBOOK COMPUTERS
q CELL PHONES
q BATTERY MANAGEMENT
q OFFICE MACHINES
q THERMOSTAT CONTROLS
q ENVIRONMENTAL MONITORING and HVAC
q ELECTROMECHANICAL DEVICE TEMPERATURE
Temperature
ALERT
1
Diode
Temp.
Sensor
Control
Logic
6 SO/I
GND
2 ∆Σ
A/D
Converter
Serial
Interface
5
CS
V+ 3
OSC
Config
and Temp
Register
4
SCK
DESCRIPTION
The TMP122 and TMP124 are SPI-compatible temperature
sensors available in SOT23-6 and SO-8 packages. Requir-
ing only a pull-up resistor for complete function, the TMP122
and TMP124 temperature sensors are capable of measuring
temperatures within 2°C of accuracy over a temperature
range of –40°C to +125°C, with operation up to 150°C.
Programmable resolution, programmable set points and shut
down function provide versatility for any application. Low
supply current and a supply range from 2.7V to 5.5V make
the TMP122 and TMP124 excellent candidates for low-
power applications.
The TMP122 and TMP124 are ideal for extended thermal
measurement in a variety of communication, computer, con-
sumer, environmental, industrial, and instrumentation appli-
cations.
Temperature
SO/I
1
Diode
Temp.
Sensor
SCK
2 ∆Σ
A/D
Converter
NC 3
GND
4
OSC
Control
Logic
8 V+
Serial
Interface
7
CS
Config
and Temp
Register
6
5
NC
ALERT
TMP122
TMP124
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SPI is a registered trademark of Motorola. All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2003, Texas Instruments Incorporated







TMP124AID pdf, 数据表
THERMOSTAT MODE (TM1/TM0)
The Thermostat Mode bits of the TMP122/TMP124 indicate to
the device whether to operate in Comparator Mode, Interrupt
Mode or Interrupt Comparator Mode. For more information on
Comparator and Interrupt Mode, see text HIGH and LOW limit
registers. The bit assignments for thermostat mode are
described in Table VII. Power on default is comparator mode.
TM1
TM0
MODE OF OPERATION
00
01
10
11
Comparator Mode
Interrupt Mode
Interrupt Comparator Mode
TABLE VII. Mode Settings of the TMP122.
POLARITY (POL)
The Polarity Bit of the TMP122/TMP124 adjusts the polarity
of the ALERT pin output. By default, POL = 0 and the ALERT
pin will be active LOW, as shown in Figure 8. For POL = 1
the ALERT Pin will be active HIGH, and the state of the
ALERT Pin is inverted.
Measured
Temperature
THIGH
TLOW
TMP122/124 ALERT PIN
(Comparator Mode)
POL = 0
TMP122/124 ALERT PIN
(Interrupt Mode)
POL = 0
TMP122/124 ALERT PIN
(Interrupt/Comparator Mode)
POL = 0
Read
Read
Time
Read
FIGURE 8. ALERT Output Transfer Function Diagrams.
FAULT QUEUE (F1/F0)
A fault condition occurs when the measured temperature
exceeds the limits set in the THIGH and TLOW registers. The
Fault Queue is provided to prevent a false alert due to
environmental noise and requires consecutive fault mea-
surements to trigger the alert function of the TMP122/TMP124.
Table VIII defines the number of consecutive faults required
to trigger a consecutive alert condition. Power-on default for
F1/F0 is 0/0.
F1 F0
00
01
10
11
CONSECUTIVE FAULTS
1
2
4
6
TABLE VIII. Fault Settings of the TMP122 and TMP124.
HIGH AND LOW LIMIT REGISTERS
In Comparator Mode (TM1/TM0 = 0/0), the ALERT Pin of the
TMP122/TMP124 becomes active when the temperature
equals or exceeds the value in THIGH and generates a
consecutive number of faults according to fault bits F1 and
F0. The ALERT pin will remain active until the temperature
falls below the indicated TLOW value for the same number of
faults.
In Interrupt Mode (TM1/TM0 = 0/1) the ALERT pin becomes
active when the temperature equals or exceeds THIGH for a
consecutive number of fault conditions. The ALERT pin
remains active until a read operation of any register occurs.
The ALERT pin will also be cleared if the device is placed in
Shutdown Mode. Once the ALERT pin is cleared, it will only
become active again by the temperature falling below TLOW.
When the temperature falls below TLOW, the ALERT pin
becomes active and remains active until cleared by a read
operation of any register. Once the ALERT pin is cleared, the
above cycle will repeat with the ALERT pin becoming active
when the temperature equals or exceeds THIGH.
In Interrupt/Comparator Mode (TM1/TM0 = 1/0), the ALERT
Pin of the TMP122/TMP124 becomes active when the tem-
perature equals or exceeds the value in THIGH and generates
a consecutive number of faults according to fault bits F1 and
F0. The ALERT pin will remain active until the temperature
falls below the indicated TLOW value for the same number of
faults and a communication with the device has occurred
after that point.
Operational modes are represented in Figure 8. Tables IX
and X describe the format for the THIGH and TLOW registers.
Power-up reset values for THIGH and TLOW are: THIGH = 80°C
and TLOW = 75°C. The format of the data for THIGH and TLOW
is the same as for the Temperature Register.
All 13 bits for the Temperature, THIGH, and TLOW registers are
used in the comparisons for the ALERT function for all con-
verter resolutions. The three LSBs in THIGH and TLOW can
affect the ALERT output even if the converter is configured for
9-bit resolution.
D15 D14 D13 D12 D11 D10 D9
H12 H11 H10
H9
H8
H7 H6
D7 D6 D5 D4 D3 D2 D1
H4 H3 H2 H1 H0
1
1
TABLE IX. THIGH Register.
D8
H5
D0
0
D15 D14 D13 D12 D11 D10 D9
L12 L11 L10
L9
L8
L7 L6
D7 D6 D5 D4 D3 D2 D1
L4 L3 L2 L1 L0 1 0
TABLE X. TLOW Register.
D8
L5
D0
0
8 TMP122, TMP124
www.ti.com
SBOS272B














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