AS1163 datasheet(36/91 Pages) AMSOSRAM

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AS1163

Functional description

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DS001075 • v2-00 • 2025-Nov-21

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6.5.7

SPI mode (Type B MCU Mode)

This is an alternative option in MCU mode that is activated when the SPI_mode bit is set in the

OTP customer block.

In this case, instead of sending a Manchester encoded data SIO1_P, the MCU will send clock

and data. Responses (like in MCU mode type A) also use separate clock and data.

Both downstream and upstream communication use a regular SPI interface with clock and

data signals with NRZ coding (no Manchester encoding):

Figure 17: SPI mode

The SPI sender role is always taken by the transmitting device, i.e., for downstream

communication by the MCU and for upstream communication by the first node. There are three

possible options to realize this on MCU side:

Figure 18: SPI mode – connection options

Referring to Figure 18 the first two options work in bidirectional mode, the third option only for

the loop-back mode. When 2 SPI ports are used on the MCU, the first is always sender and

the second is always receiver. The two resistors in the second case are needed to decouple

the sender and receiver pins (the ports in the case that both act as sender at the same time).

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