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AS5130

Datasheet - Detailed Descr i pti on

7.8.3 Polling Mode

Target of this mode is a reduction of the average power consumption. In this mode, the IC supply is pulsed, thereby reducing the average power

consumption to a fraction. The actual angle information and multi turn count value is not lost; polling mode is especially suited for battery

powered applications. The IC is furthermore capable of generating a WAKE signal as soon as the magnet’s position has changed, but only if the

supply of the IC is powered-on again. By means of the WAKE signal, the system’s power consumption can be further decreased, if certain

modules are activated on demand.

Figure 18. External Circuitry for Polling Mode

The procedure is as follows:

1. Initial startup: The circuit starts up with invalid trim values, which are read back from the storage registers; the command rst_otp

(command 19 – 10011) must be sent to read out valid trim values from the OTP.

2. These values are copied to the storage registers if OTP<8> (Wake enable) is set (must be set for polling mode).

3. The values of AGC counter, actual angle, multi turn counter, hysteresis setting, wake threshold and gain setting are continuously

updated in the storage registers.

4. The actual angle is stored as a reference by sending command STORE REF (command 3 – 00011). without this reference angle, a

WAKE is generated at every startup.

the difference between both exceeds the threshold, a WAKE pulse is generated.

WAKE

t_on

t_off

t_wakeup

100n

+5V

>1.5K