Freescale Semiconductor FRDM-FXS-MULTI 데이터 시트
MPL3115A2
Sensors
28
Freescale Semiconductor, Inc.
7.11
Pressure/Altitude Window
7.11.1 P_WND_MSB, P_WND_LSB (0x19, 0x1A)
Pressure/Altitude window value. Unsigned 16-bit value of window value in meters or in 2 Pa units
7.12
Temperature Window
7.12.1 T_WND (0x1B)
Temperature alarm window value. Unsigned 8-bit value
°C.
7.13
Minimum Pressure
7.13.1 P_MIN_MSB, P_MIN_CSB, P_MIN_LSB (0x1C, 0x1D, 0x1E)
Register with captured minimum Pressure/Altitude value.
The Altitude data is arranged as 20-bit 2’s complement value in meters. Stored as meters with the 16 bits of P_MIN_MSB and
P_MIN_CSB and with fractions of a meter stored in 4 bits in position 7-4 of P_MIN_LSB.
The Pressure is arranged as 20-bit unsigned data in Pascals. The first 18 bits are located in P_MIN_MSB, P_MIN_CSB and
bits 7-6 of P_MIN_LSB. The 2 bits in position 5-4 of P_MIN_LSB represent the fractional component.
The register is cleared on power-up or manually by writing ‘0’ to the register.
Table 44. P_WND_LSB Register
7
6
5
4
3
2
1
0
R
P_W15
P_W 14
P_W 13
P_W 12
P_W 11
P_W 10
P_W 9
P_W 8
W
Reset
0
0
0
0
0
0
0
0
Table 45. P_WND_MSB Description
7
6
5
4
3
2
1
0
R
P_W7
P_W 6
P_W 5
P_W 4
P_W 3
P_W 2
P_W 1
P_W 0
W
Reset
0
0
0
0
0
0
0
0
Table 46. T_WND Register
7
6
5
4
3
2
1
0
R
T_W7
T_W6
T_W5
T_W4
T_W3
T_W2
T_W1
T_W0
W
Reset
0
0
0
0
0
0
0
0
Table 47. P_MIN_MSB Register
7
6
5
4
3
2
1
0
R
P_MIN 19
P_MIN 18
P_MIN 17
P_MIN 16
P_MIN 15
P_MIN 14
P_MIN 13
P_MIN 12
W
Reset
0
0
0
0
0
0
0
0
Table 48. P_MIN_CSB Register
7
6
5
4
3
2
1
0
R
P_MIN 11
P_MIN 10
P_MIN 9
P_MIN 8
P_MIN 7
P_MIN 6
P_MIN 5
P_MIN 4
W
Reset
0
0
0
0
0
0
0
0
Table 49. P_MIN_LSB Register
7
6
5
4
3
2
1
0
R
P_MIN 3
P_MIN 2
P_MIN 1
P_MIN0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0