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LM74CIMX-5 Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM74CIMX-5
Descripción Electrónicos  SPI/MICROWIRE??12-Bit Plus Sign Temperature Sensor
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM74CIMX-5 Datasheet(HTML) 10 Page - National Semiconductor (TI)

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1.0 Functional Description (Continued)
1.5 INTERNAL REGISTER STRUCTURE
The LM74 has three registers, the temperature register, the
configuration register and the manufacturer’s/device identifi-
cation register. The temperature and manufacturer’s/device
identification registers are read only. The configuration reg-
ister is write only.
1.5.1 Configuration Register
(Selects shutdown or continuous conversion modes):
(Write Only):
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
XXXXXXX
Shutdown
D0–D15 set to XX FF hex enables shutdown mode.
D0–D15 set to 00 00 hex sets Continuous conversion mode.
Note: setting D0-D15 to any other values may place the LM74 into a manufacturer’s test mode, upon which the LM74 will stop
responding as described. These test modes are to be used for National Semiconductor production testing only. See Section 1.2
Serial Bus Interface for a complete discussion.
1.5.2 Temperature Register (after power-up, before first complete temperature conversion)
(Read Only):
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
1111111000000
X
X
D0–D1: Undefined. TRI-STATE will be output on SI/0.
D2–D15: Power-on Reset (POR) values.
1.5.3 Temperature Register (after completion of first temperature conversion)
(Read Only):
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
MSB
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
LSB
1
X
X
D0–D1: Undefined. TRI-STATE will be output on SI/0.
D2: High.
D3–D15: Temperature Data. One LSB = 0.0625˚C. Two’s complement format.
1.5.4 Manufacturer’s Device ID Register
(Read Only):
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
0000000000000
X
X
D0–D1: Undefined. TRI-STATE will be output on SI/0.
D2–D15: Manufacturer’s/Device ID Data. This register is accessed whenever the LM74 is in shutdown mode.
www.national.com
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