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Appendix 10: Conversion coefficients used in humidity and temperature computation
formulas
Table 42 Temperature conversion coefficents
VDD
5V
4V
3.5V
3V
2.5V
d1(C)
-40.1
-39.8
-39.7
-39.6
-39.4
d1(F)
-40.2
-39.6
-39.5
-39.3
-38.9
SOT
14bit
12bit
d2(◦C)
0.01
0.04
d2(◦F)
0.018
0.072
Table 43 Optimized humidity conversion coefficients
SORH
12bit
8bit
c1
-2.0468
-2.0468
c2
0.0367
0.5872
c3
-1.5955E-6
-4.0845E-4
Table 44 Temperature compensation coefficients
SORH
12bit
8bit
t1
0.01
0.01
t2
0.00008
0.00128
Appendix 11: Accelerometer control registers and timing requirements
Table 45 SPI – serial peripheral interface timing
Value
Symbol
Parameter
tc(SPC)
fc(SPC)
tsu(CS)
th(CS)
tsu(SI)
th(SI)
tv(SO)
th(SO)
tdis(SO)
SPI clock cycle
SPI clock frequency
CS setup time
CS hold time
SDI input setup time
SDI input hold time
SDO valid output time
SDO output hold time
SDO output disable time
Min
125
Max
8
5
10
5
15
Unit
Ns
MHz
ns
55
7
50
Table 46 Accelermeter control register number 1: CTRL_REG1(20h)
PD1
PD1, PD0
DF1, DF0
PD0
DF1
DF0
ST
Power Down Control
(00: power down mode; 01,10,11: device on)
Decmation Factor Control
143
Zen
Yen
Xen