ADAS1000-4BSTZ datasheet(72/80 Pages) AD

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ADAS1000-3/ADAS1000-4

Data Sheet

Table 51. Read AC Lead-Off Amplitude Registers (LOAMxx) Address 0x31 to Address 0x33, Reset Value = 0x0000001

REE

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

[23:16]

Reserved

Reserved.

[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/216.

Maximum 0xFFFF = VREF/GAIN.

RMS = [π/(2√2)] × [(Code × VREF)/(GAIN × 216)]

Peak-to-peak = π × [(Code × VREF)/(GAIN × 216)]

This register is not part of framing data, but can be read by issuing a register read command of this address.

Table 52. Pace Width and Amplitude Registers (PACExDATA) Address 0x3A to Address 0x3C, Reset Value = 0x0000001, 2

REE

Default

Bit

Name

Function

[31:24]

Address [7:0]

0x3A: PACE1DATA

0x3B: PACE2DATA

0x3C: PACE3DATA

[23:8]

Pace height

Measured pace height in signed twos complement value

0 = 0

1 = VREF/gain/216

N = N × VREF/gain/216

[7:0]

Pace width

Measured pace width in 128 kHz samples

N: (N + 1)/128 kHz = width

12: (12 + 1)/128 kHz = 101.56 µs (minimum when pace width filter enabled)

255: (255 + 1)/128 kHz = 2.0 ms

Disabling the pace width filter allows the pace measurement system to

return values of N < 12, that is, pulses narrower than 101.56 μs.

These registers are not part of framing data but can be read by issuing a register read command of these addresses.

ADAS1000-4 model only, ADAS1000-3 model does not contain these features.

Rev. B | Page 72 of 80

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