AS39513 datasheet(41/108 Pages) AMSCO

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ams Datasheet

Page 41

[v1-10] 2018-Apr-25

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AS39513 − Detailed Description

When CE is high, DOUT is used as part of the SPI. When CE is

low and the IO mode is set using the Direct SPI command 'Set

IO Mode' to Application mode, then the function of DOUT can

be configured by DOMD[1:]0] and DOSCR[1:0].

The functions of the DOUT can be programmed as follows

according to the System parameter DOMD[1:0] stored in the

“Logging Control Parameters” address 0x439 (bits 5- 4) in the

EEPROM:

Figure 29:

DOMD[1:0]: DOUT Functional Options (GPIO)

DOSRC [1:0] stored in the “Logging Control Parameters”address

0x439 (bits 7- 6) in the EEPROM:

Figure 30:

DOSRC[1:0]: DOUT Functional Options: Digital Output Source (when not in SPI communication).

Bit 5 Bit 4

I/O

Structure

Function

Output

CMOS output

CMOS (push-pull) output (this setting is used in SPI mode)

Output

Pull-up

Pull-up output

Output

Pull-down output

DOUT is inverted relative to DOSRC description below

Output

High impedance

High impedance (disconnected) output. Default value.

Bit 7

Bit 6

Function

DOUT is a copy of the external interrupt comparator output.

DOUT is high when an ISO 15693 command has been recognized and is being processed.

DOUT is high when the RF field is available

DOUT is the logical OR of EEFULL, ADCERR, LOWBAT, and OVLIM. If OSCEN=1, the output is

AND’d with a modulated signal that is 1/32 second high (32 counts of osc1k) and 31/32

second low (992 counts of osc1k).

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