Datasheet

Data Sheet ADAS1000-3/ADAS1000-4
Rev. A | Page 63 of 76
Table 40. Pace Edge Threshold Register (PACEEDGETH) Address 0x0E, Reset Value = 0x000000
1
R
/W
Default Bit Name Function
R/W 0 [23:16] PACE3EDGTH Pace edge trigger threshold
0 = PACEAMPTH/2
1 = VREF/gain/2
16
N = N × VREF/gain/2
16
R/W
0
[15:8]
PACE2EDGTH
R/W 0 [7:0] PACE1EDGTH
1
ADAS1000-4 model only, ADAS1000-3 model does not contain these features.
Table 41. Pace Level Threshold Register (PACELVLTH) Address 0x0F, Reset Value = 0x000000
1
R
/W
Default Bit Name Function
R/W 0 [23:16] PACE3LVLTH[7:0] Pace level threshold; This is a signed value
−1 = 0xFF = −VREF/gain/2
16
0 = 0x00 = 0 V
+1 = 0x01 = +VREF/gain/2
16
N = N × VREF/gain/2
16
R/W 0 [15:8] PACE2LVLTH[7:0]
R/W 0 [7:0] PACE1LVLTH[7:0]
1
ADAS1000-4 model only, ADAS1000-3 model does not contain these features.
Table 42. Read Electrode/Lead Data Registers (Electrode/Lead) Address 0x11 to 0x13, Reset Value = 0x000000
1
R
/W
Default Bit Name Function
[31:24] Address [7:0] 0x11: LA or Lead I.
0x12: LL or Lead II.
0x13: RA or Lead III.
R 0 [23:0] ECG data Channel data value. Data left justified (MSB) irrespective of data rate.
In electrode format, the value is an unsigned integer.
In vector format, the value is a signed twos complement integer format.
Lead/vector format has a 2× range compared to electrode format because it can swing
from +VREF to –VREF; therefore, the LSB size is doubled.
Electrode format and analog lead format:
Minimum value (000…) = 0 V
Maximum value (1111….) = VREF/gain
LSB = (2 × VREF/gain)/(2
N
– 1)
Digital Lead format:
Minimum value (1000…) = −(VREF/gain)
Maximum value (0111….) = +VREF/gain
LSB = 4 × (VREF/gain)/(2
N
– 1)
where N = number of data bits: 16 for 128 kHz data rate or 24 for 2 kHz/16 kHz data rate.
1
If using 128 kHz data rate in frame mode, only the upper 16 bits are sent. If using the 128 kHz data rate in regular read/write mode, all 32 bits are sent.