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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

2’b11 – Limit crossing mode. Enable logging only if one of the

limit check conditions is different than that from the previous

logging event. Sensors are always logged to 10-bit accuracy. If

a measurement is logged, the value of the measurement

counter is also logged.

LOGFMT – Logging format.

0 = Only the 8 MSB’s of the 10-bit ADC result for each

measurement are logged. This is only valid when LOGMD =

2’b00. For other values of LOGMD, 10 bits are always used.

1 = All 10 bits of the ADC result for each measurement are

logged.

EXCPR – Use compressed format for external sensor.

0 = Uncompressed ADC result used.

1 = An 8-bit compressed version of the 10-bit ADC result is

logged. (This is only valid when LOGMD = 2’b00 and LOGFMT =

0.)

The compression algorithm for the result ex_res_ff[9:0] is as

follows:

Figure 37:

Compression Algorithm

EXIVSET[1:0] – Voltage threshold for external interrupt. This

value is mapped directly to exi_vset_o[1:0]. See the description

of the External Sensor Interrupt circuits for more information.

The threshold voltages are given in the table below, where vdda

is the digital supply voltage.

Condition

Compressed Result

ex_res_ff[9] = 1

{ 2’b11, ex_res_ff[8:3] }

ex_res_ff[9:8] = 2’b01

{ 2’b10, ex_res_ff[7:2] }

ex_res_ff[9:7] = 3’b001

{ 2’b01, ex_res_ff[6:1] }

Otherwise

{ 2’b00, ex_res_ff[5:0] }

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