AS1163 datasheet(26/91 Pages) AMSOSRAM

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AS1163

Functional description

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Considering the 500 Hz mode as an example, PWM period is effectively <1.8ms (5% clk

tolerance included). After SETADC command, wait time is suggested to be two PWM cycles.

In this particular mode, the device alternates a temperature measurement with a Vforward

measurement of the selected driver. Once the ADC data is read, using the READADCDAT

command, the device returns to the default measurement routine.

In case no ADC measurement is requested, the internal measurement routine is observed

according to the PWM activation sequence, which results in a fresh reading nominally every

18ms. This is only relevant for the ASKVINFO functionality.

The picture below shows, not in scale, the behavior of the ADC when a measurement on a

specific driver is requested.

Figure 10: Typical behavior of the ADC

6.4.1

Measurement routine

The ADC, when enabled, is periodically executing a measurement routine:

•

Temperature sensor measurement

R0, R1, R2 Vf voltage

•

Temperature sensor measurement

B0, B1, B2 Vf voltage

•

Temperature sensor measurement

G0, G1, G2 Vf voltage

The temperature sensor reading is stored in the temperature register, while the forward voltage

readings (from R0 to G2 if applicable) are constantly updating the VFMAX register (only for

drivers that are not used for addressing, SYNC. pin or I²C bridge). VFMAX register stores the

largest forward voltage observed in the node.

Upon receiving the command SETADC, which specifies the particular driver of the total 9

drivers to be measured, the ADC DATA register is filled with the next measurement of the

specified driver output.

AS1163 Datasheet(PDF) 26 Page - ams-OSRAM AG