ADAS1000BSTZ datasheet(67/80 Pages) AD

67 / 80 page

Data Sheet

ADAS1000/ADAS1000-1/ADAS1000-2

Rev. A | Page 67 of 80

Table 45. Lead-Off Status Register (LOFF) Address 0x1D, Reset Value = 0x000000

R/W

Default

Bit

Name

Function

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 46).

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.

LA lead-off status

LL lead-off status

RA lead-off status

V1 lead-off status

V2 lead-off status

CELO

[17:14]

Reserved

Reserved.

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.

LLADCOR

RAADCOR

V1ADCOR

V2ADCOR

[7:0]

Reserved

Reserved.

Table 46. DC Lead-Off Register (DCLEAD-OFF) Address 0x1E, Reset Value = 0x0000001

R/W

Default

Bit

Name

Function

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.

LA input

overrange

LL input

overrange

RA input

overrange

CE input

overrange

[19:14]

[8:3]

Reserved

Reserved.

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.

LA input

underrange

LL input

underrange

RA input

underrange

CE input

underrange

[1:0]

Reserved

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

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