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AS5130

Datasheet - Application In form atio n

8.3 Application Example III: Polling Mode

Figure 24. Polling Mode

Once powered up for at least 2.5ms, the AS5130 can be operated in a pulsed mode, where it is periodically turned on/off by a high side FET

(PMOS) switching transistor with a low Ron (<10

Ω). The on-time is at least 250µs in order to perform one measurement. A valid measurement

result can be verified by checking the lock bit (ADC is locked) in the serial data stream.

After startup an OTP reset has to be performed in order to read out valid trimming information. Then a special SSI command (STORE REF)

copies the actual angle into a buffered reference angle register. Now the AS5130 can be turned off. Special registers will be buffered by the low

angle difference is larger than a threshold value (wlsb, SSI command WRITE CUST), the AS5130 will send an interrupt request to an external

device via the WAKE pin.

pulsed mode depends on the supply current in active mode and the duty cycle of the on/off pulse:

(EQ 10)

= 47.5µA

(EQ 11)

micro

controller

AS5130

100n

+5V

VDD

CS

VDD

CLK

DIO

AS5130

S

N

on/off

10k

Cx

>1µF

+5V

I

active

∗t

on

t

on

t

off

+

-------------------------

19mA∗250

μs

250

μs 99.75ms

+

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