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TMP007AIYZFT データシートの表示(PDF) - Texas Instruments

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TMP007AIYZFT Infrared Thermopile Sensor with Integrated Math Engine TI
Texas Instruments TI
TMP007AIYZFT Datasheet PDF : 55 Pages
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TMP007
SBOS685C – APRIL 2014 – REVISED JULY 2015
ALRTEN:
Alert Pin Enable. Bit 8
Makes ALERT pin controlled by the alert flag bit. The ALERT pin is active low. The ALRTEN bit is mirrored in the status mask
and enable register. Writing to the ALRTEN bit in the status mask and enable register also sets this bit, and vice versa.
ALRTF:
Cumulative Alert Flag. Bit 7 (Read Only)
This flag is the logical OR of all enabled flags, and is cleared when the status register is read in INT mode or at the end of a
conversion when all enabled flags are 0 in COMP mode.
It is mirrored in Status register.
TC:
Transient Correction Enable. Bit 6
Setting this bit turns on the transient correction enabling sensor voltage and object temperature output filtering.
INT/COMP: INT/COMP Mode. Bit 5
The INT/COMP bit controls whether the limit flags are in INTERRUPT (INT) Mode (0) or COMPARATOR (COMP) Mode (1).
It controls the behavior of the limit flags (LH, LL, OH, OL) and the data invalid flag (nDVF) from the status register.
7.5.4 TOBJ Object Temperature Result Register (address = 03h) [reset = 0000h]
Figure 33. TOBJ Object Temperature Result Register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
T13 T12 T11 T10 T9
T8
T7
T6
T5
T4
T3
T2
T1
T0
— nDV
R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
T13 to T0:
Temperature result. Bits 15 to 2
The data format is twos complement, 14 bits, and 0.03125°C per LSB. Full scale allows a result of up to ±256°C. Reset
value is 00h.
nDV:
Data invalid bit. Bit 0
If this bit is set, it indicates that the calculated object temperature is not valid due to invalid operations in the math engine.
The bit is reset in the next valid conversion.
7.5.5 Status Register (address = 04h) [reset = 0000h]
The status register flags are activated whenever their limit is violated, and latch if the INT/COMP bit is in INT
mode (see configuration register). In INT mode these flags are cleared only when the status register is read. If
the flag is set from a previous conversion, and at the end of the next conversion, the corresponding limit is not
violating anymore, the flag is not cleared when in INT mode. In COMP mode, these flags are set whenever the
corresponding limit is violated at the end of a conversion, and cleared if they are not.
Figure 34. Status Register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ALRTF CRTF OHF OLF LHF LLF nVDF MCRPT SNRL —
R-0
R-0 R-0 R-0 R-0 R-0 R-0
R-0
R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
ALRTF:
Cumulative Alert Flag Bit. Bit 15
This flag is the logical OR of all enabled flags, and is cleared when the status register is read in INT mode or at the end of a
conversion when all enabled flags are 0 in COMP mode.
CRTF:
OHF:
Conversion Ready Flag. Bit 14
The conversion ready flag is provided to help coordinate one-shot conversions for temperature measurements. The bit is set
after the local and object temperature conversions have completed and the results are ready to be read in the result registers.
This flag can be cleared by reading the status register, writing to the configuration register or reading any of the results registers
(TDIE, TOBJ, and so on). This flag is not affected by the INT/COMP bit setting and is always in latched mode.
Object Temperature High Limit Flag. Bit 13
This bit is set to 1 if the result in the object temperature register exceeds the value in the object temperature high limit register.
In INT mode, this bit is cleared when the status register is read.
OLF:
Object Temperature Low Limit Flag. Bit 12
This bit is set to 1 if the result in the object temperature register is less than the value in the object temperature low limit register.
In INT mode, this bit is cleared when the status register is read. In COMP mode, this bit is disabled and always reads 0.
LHF:
Local Temperature (TDIE) High Limit Flag. Bit 11
This bit is set to 1 if the result in the TDIE local temperature result register exceeds the value in the local temperature high limit
register. In COMP mode, the bit is cleared to 0 when the result in the TDIE local temperature result register is less than the
object temperature low limit. In INT mode, the bit is cleared when the status register is read.
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