Datasheet

Data Sheet ADAS1000/ADAS1000-1/ADAS1000-2
Rev. A | Page 69 of 80
Table 49. User Gain Calibration Registers (CALxx) Address 0x21 to Address 0x25, Reset Value = 0x000000
R/W
Default Bit Name Function
[31:24] Address [7:0] 0x21: calibration LA.
0x22: calibration LL.
0x23: calibration RA.
0x24: calibration V1.
0x25: calibration V2.
R/W 0 23 USRCAL User can choose between default calibration values or user calibration values for GAIN 0,
GAIN 1, GAIN 2.
Note that for GAIN 3, there is no factory calibration.
0 = default calibration values (factory calibration).
1 = user calibration values.
R/W 0 [22:12] Reserved Reserved, set to 0
R/W 0 [11:0] CALVALUE Gain calibration value.
Result = data × (1 + GAIN × 2
−17
).
The value read from this register is the current gain calibration value. If the USRCAL bit is set
to 0, this register returns the default value for the current gain setting.
0x7FF (+2047) = ×1.00000011111111111b.
0x001 (+1) = ×1.00000000000000001b.
0x000 (0) = ×1.00000000000000000b.
0xFFF (−1) = ×0.11111111111111111b.
0x800 (−2048) = ×0.11111100000000000b.
Table 50. Read AC Lead-Off Amplitude Registers (LOAMxx) Address 0x31 to Address 35, 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.
0x34: V1 ac lead-off amplitude.
0x35: V2 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.