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AS8579

Electrical Characteristics

Datasheet

• PUBLIC

DS000707

• v4-01 • 2022-Jun-08

│ 11

5.3

Sensor Driver

The Sensor Driver has the ability to drive a continuously changing load of 20 pF to 2000 pF in parallel

with 5

kΩ, with a 1.0 Vp-p AC term over a frequency range of 45 kHz – 125 kHz. The driver (gain

1 V/V) provides a low impedance output to drive the sensor lines (SEN0

– SEN9).

Figure 8:

Output Driver and Current Sensing

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

SD_VDC

Output DC voltage

1.18

1.23

1.28

SD_AC2

Output voltage, TXV=2

1.020

1.070

1.120

Vpp

SD_AC1

Output voltage, TXV=1

0.510

0.535

0.560

Vpp

IOUT_AC

Output AC peak current

8.5

I_SHORT

Output short current to GND

SD_GAIN

Gain closed loop

0.99

1.01

V/V

ROUT

Output impedance closed

loop

CLOAD

Output total load capacitance

2000

5.4

Diagnostic Thresholds

In Figure 9 the thresholds are shown, which will trigger setting the Diagnostics in the Status Register

(see 7.2.2).

Positive Diagnostic threshold must be higher than max level of the diagnosed signal.

Negative Diagnostic threshold must be lower than min level of the diagnosed signal.

Figure 9:

Diagnostic Threshold Levels

Symbol

Parameter

Min

Typ

Max

Unit

REGF_L

VREG detection threshold low

3.0

3.15

3.3

REGF_H

VREG detection threshold high

3.6

3.8

BPFF_L

Detection threshold low

0.25

0.3

0.33

BPFF_H

Detection threshold high

VREG-0.33

VREG-0.30

VREG-0.25

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