AS39513 datasheet(59/108 Pages) AMSCO

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ams Datasheet

Page 59

[v1-10] 2018-Apr-25

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AS39513 − Detailed Description

Figure 38:

Voltage Threshold for External Interrupt

EICUR – Enable the current drive for the external sensor

interrupt. This is independent of the EXCSET current source and

is only used if EIEN = 1.

0 = Disable external sensor interrupt current.

1 = Enable current drive for external sensor interrupt if EIEN = 1.

EXCSET[4:0] – Current drive select for external sensor

measurement. This current is only active during the external

sensor measurement. It is not used when the AS39513 is in low

power mode waiting for an interrupt or timer event. This value

is mapped directly to trf_iset_o[4:0]. See the description of the

Trimmed Reference circuit for more information.

OVLIM – Limit count threshold exceeded.

0 = No limit count thresholds exceeded.

1 = One of the eight limit count thresholds have been exceeded.

ACTPOR – Active wakeup after power-up reset.

0 = The AS39513 has not had a reset direct to ACTIVE mode

event.

1 = The AS39513 has had a power on reset occur when WAKEMD

= 1 and ACTIVE = 1.

LOWBAT – Low battery condition.

0 = No low battery condition measured.

1 = The battery check operation (BATCHK = 1) resulted in a low

battery indication.

ADCERR – ADC error flag.

ADCERR is a flag in system EEPROM which is set by an under or

overflow of the ADC during logging measurements. Once set it

remains set until the system EEPROM bit is cleared by a write

command to system EEPROM memory. The ADCERR flag is not

set by an ADC under or overflow during a Do Measurement

command.

0 = No ADC error has occurred.

1 = An ADC error has occurred, either from an input signal out

of range or a poorly chosen combination of reference voltage

settings.

EXIVSET[1:0]

Voltage Threshold

2’b00

vdda * 0.256

2’b01

vdda * 0.083

2’b10

vdda * 0.355

2’b11

vdda * 0.438

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