Datasheet

Data Sheet ADAS1000-3/ADAS1000-4
Rev. A | Page 67 of 76
Table 50. Read AC Lead-Off Amplitude Registers (LOAMxx) Address 0x31 to Address 0x33, Reset Value = 0x000000
1
R
/W
Default Bit Name Function
[31:24] Address [7:0] 0x31: LA ac lead-off amplitude.
0x32: LL ac lead-off amplitude.
0x33: RA ac lead-off amplitude.
R/W 0 [23:16] Reserved Reserved.
R 0 [15:0] LOFFAM Measured amplitude.
When ac lead-off is selected, the data is the average of the rectified 2 kHz band-pass filter
with an update rate of 8 Hz and cutoff frequency at 2 Hz. The output is the amplitude of the
2 kHz signal scaled by 2/π approximately = 0.6 (average of rectified sine wave). To convert to
rms, scale the output by π/(2√2).
Lead-off (unsigned).
Minimum 0x0000 = 0 V.
LSB 0x0001= VREF/GAIN/2
16
.
Maximum 0xFFFF = VREF/GAIN.
1
This register is not part of framing data, but can be read by issuing a register read command of this address.
Table 51. Pace Width and Amplitude Registers (PACExDATA) Address 0x3A to Address 0x3C, Reset Value = 0x000000
1, 2
R
/W
Default Bit Name Function
[31:24] Address [7:0] 0x3A: PACE1DATA
0x3B: PACE2DATA
0x3C: PACE3DATA
R 0 [23:8] Pace height Measured pace height in signed twos complement value
0 = 0
1 = VREF/gain/2
16
N = N × VREF/gain/2
16
R
0
[7:0]
Pace width
Measured pace width in 128 kHz samples
N: N/128 kHz = width
12: 12/128 kHz = 93 µs
255:255/128 kHz = 2.0 ms
1
These registers are not part of framing data but can be read by issuing a register read command of these addresses.
2
ADAS1000-4 model only, ADAS1000-3 model does not contain these features.