Murata Electronics Oy 5/5 5/5
www.muratamems.fi Doc. Nr. 82823 00 D
Application Note for Acceleration Output Reading (16 bit output sensitivity)
This is addition to SCA8X0_21X0_3100 Product Family Specification chapter 3.1.
DOUT_LSB
Address: 4h
Acceleration data LSB frame
Read always DOUT_MSB prior to DOUT_LSB.
DOUT_MSB
Address: 5h
Acceleration data MSB frame
Reading of this register latches DOUT_LSB.
The bit level description of acceleration data from DOUT_LSB ... DOUT_MSB registers is
presented below. The acceleration data is presented in 2's complement format. At 0 g
acceleration the output is ideally 0000h.
+/-1g product DOUT MSB bits(7:0) DOUT LSB bits(7:0) 16b
Bit number
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 [-] Bits (15:0)
SCA8xx s 512,0 256,0 128,0 64,0 32,0 16,0 8,0 4,00 2,00 1,00 0,50 0,25 0,13 0,06 0,03 [mg] [Dec]
+1g position 0 1 1 1 1 1 0 1 0 0 0 0 0 0 0 0 1000 32000
-1g position 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 -1000 -32000
+Full-scale 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1023 32767
-Full-scale 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1024 -32768
s = sign bit
Acceleration bits can be converted to mg acceleration (Acc) using following equation
02122
232425262728292102112122132142
32
1
13
4456789101112131415
bbb
bbbbbbbbbbbbs
mgAcc
