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ADAS1000-4BSTZ 数据表(PDF) 70 Page - Analog Devices

部件名 ADAS1000-4BSTZ
功能描述  Low Power, Three Electrode Electrocardiogram (ECG) Analog Front End
PDF  80 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADAS1000-4BSTZ 数据表(HTML) 70 Page - Analog Devices

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ADAS1000-3/ADAS1000-4
Data Sheet
Table 47. Lead-Off Status Register (LOFF) Address 0x1D, Reset Value = 0x000000
AA
REE
AA
/W
Default
Bit
Name
Function
R
0
23
RLD lead-off
Status
Electrode connection status.
If either dc or ac lead-off is enabled, these bits are the corresponding lead-off status. If
both dc and ac lead-off are enabled, these bits reflect only the ac lead-off status. DC
lead-off is available in the DCLEAD-OFF register (see Table 48).
The common electrodes have only dc lead-off detection.
An ac lead-off signal can be injected into the common electrode, but there is no ADC
input to measure its amplitude. If the common electrode is off, it affects the ac lead-off
amplitude of the other electrodes.
These bits accumulate in the frame buffer and are cleared when the frame buffer is
loaded into the SPI buffer.
0 = electrode is connected.
1 = electrode is disconnected.
22
LA lead-off status
21
LL lead-off status
20
RA lead-off status
13
CELO
R
0
[19:14]
Reserved
Reserved.
R
0
12
LAADCOR
ADC out of range error.
These status bits indicate the resulting ADC code is out of range.
These bits accumulate in the frame buffer and are cleared when the frame buffer is
loaded into the SPI buffer.
11
LLADCOR
10
RAADCOR
R
0
[9:0]
Reserved
Reserved.
Table 48. DC Lead-Off Register (DCLEAD-OFF) Address 0x1E, Reset Value = 0x0000001
AA
REE
AA
/W
Default
Bit
Name
Function
R
0
23
RLD input
overrange
The dc lead-off detection is comparator based and compares to a fixed level. Individual
electrode bits flag indicate if the dc lead-off comparator threshold level has been
exceeded.
0 = electrode < overrange threshold, 2.4 V.
1 = electrode > overrange threshold, 2.4 V.
22
LA input
overrange
21
LL input
overrange
20
RA input
overrange
13
CE input
overrange
R
0
[19:14]
[8:3]
Reserved
Reserved.
R
0
12
RLD input
underrange
The dc lead-off detection is comparator based and compares to a fixed level. Individual
electrode bits indicate if the dc lead-off comparator threshold level has been exceeded.
0 = electrode > underrange threshold, 0.2 V.
1 = electrode < underrange threshold, 0.2 V.
11
LA input
underrange
10
LL input
underrange
9
RA input
underrange
2
CE input
underrange
R
0
[1:0]
Reserved
1
This register is not part of framing data, but can be read by issuing a register read command of this address.
Rev. B | Page 70 of 80



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