AS5161

Datasheet - Detailed Descr i p ti on

www.ams.com

Revision 1.1

15 - 35

For efficient use of diagnostics, it is recommended to program to clamping levels CLL and CLH.

8.3 PWM Output Driver Parameters

The output stage is configured in a open drain output.

The PWM duty cycle represents the angular output data. All programming features are available for the PWM mode as well. The PWM period is

programmable in four steps and can be programmed by PWMF<2:0>.

Ω

8.3.1 Noise Suppressor

The noise suppressor is inserted after the angle calculation (first stage) and after range expansion (second stage). This function is capable to

reduce the noise level down to 1 LSB peak to peak over different programing ranges.

4 possible configurations of the noise suppressor can be selected via the OTP bits FILTERCFG<1:0>.

8.3.2 Hysteresis Function

AS5161 device includes a hysteresis function to avoid sudden jumps from CLH to CLL and vice versa caused by noise in the full turn

configuration.

The hysteresis amplitude can be selected via the OTP bits HYSTSEL<1:0>.

Table 9. Different Failure Cases of AS5161

Type

Failure Mode

Symbol

Failure Band

Note

Internal alarms (failures)

Out of magnetic range

(too less or too high magnetic input)

MAGRng

High/Low

Programmable by OTP bit DIAG_HIGH

Cordic overflow

COF

High/Low

Programmable by OTP bit DIAG_HIGH

Offset compensation finished

OCF

High/Low

Programmable by OTP bit DIAG_HIGH

Watchdog fail

WDF

High/Low

Programmable by OTP bit DIAG_HIGH

Oscillator fail

OF

High/Low

Programmable by OTP bit DIAG_HIGH

Application related

failures

Overvoltage condition

OV

High

Dependant on the load resistor

Pull up

→ failure band high

Broken VDD

BVDD

Broken VSS

BVSS

Short circuit output

SCO

High

Switch off

→ short circuit dependent

Table 10. PWM Parameters Output Driver

Symbol

Parameter

Conditions

Min

Typ

Max

Units

PWMF1

PWM frequency 7

PWMF<2:0>=111

109.86

122

134.28

Hz

PWMF2

PWM frequency 6

PWMF<2:0>=110

179.78

200

219.73

Hz

PWMF3

PWM frequency 5

PWMF<2:0>=101

219.73

244

268.55

Hz

PWMF4

PWM frequency 4

PWMF<2:0>=100

329.59

366

402.83

Hz

PWMF5

PWM frequency 3

PWMF<2:0>=011

494.38

549

604.25

Hz

PWMF6

PWM frequency 2

PWMF<2:0>=010

659.18

732

805.66

Hz

PWMF7

PWM frequency 1

PWMF<2:0>=001

988.77

1100

1208.50

Hz

PWMF8

PWM frequency 0

PWMF<2:0>=000

1977.54

2197

2416.2

Hz

PWMDC

PWM duty cycle range

info parameter

4

96

%

PWMVOL

Output voltage low

IOUT=5mA

0

0.4

V

PWMSRF

PWM slew rate (falling edge)

Between 75% and 25%

RPUOUT=4K

Ω; CLOUT=1nF

VDD=5V

12

4

V / µs