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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Reference Voltage Generator

There are two programmable reference voltages used in the

AS39513 sensor system, V1 and V2. In a trimmed device, these

voltages are

Where VSTEP is 50mV, and V1SET, V2SET values are determined

by the measurement type according to the Figure 22 below. The

range of possible V1 and V2 ADC reference voltages are shown

in Figure 23. If the temperature range is changed from the

default by changing TV1SET and/or TV2SET the chip will need

recalibrating to produce new trim values. The same is valid for

EV1SET, EV2SAT.

ADC input voltage range: V2 ≤ Vin ≤ 2V2-V1

Note this has the consequence that TV2SET must be set to be

≥ TV1SET-1 so that the ADC input signal range V2-V1 is positive.

Similarly EV2SET must be set so that EV2SET ≥ EV1SET-1.

Figure 22:

ADC Reference Voltage (defaults shown in brackets)

Figure 23:

ADC Reference Voltages Versus V1SET, V2SET Values

Value

Measurement Type

Temperature

External

Battery

V1SET

TV1SET[2:0] (3'b010)

EV1SET[2:0] (3'b010)

(3'b000)

V2SET

TV2SET[2:0] (3’b011)

EV2SET[2:0] (3'b101)

(3'b001)

V1SET

V2SET

160mV

260mV

1210mV

1310mV

260mV

360mV

3310mV

3410mV

360mV

460mV

5410mV

5510mV

460mV

560mV

7510mV

7610mV

(EQ1)

VSTEP 3.2 V1SET

()

(EQ2)

VSTEP 5.2 V2SET

()

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