KMA310 datasheet(43/71 Pages) NXP

43 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

43 / 71

16.3.2 Read access

To read data from the sensor, perform the following procedure:

1. Start condition: The master drives a rising edge after a LOW level

2. Command: The master sends a read command (CMD0 = 1)

3. Handover: The master sends a handover bit that is a logic 0 and disables the output

after a three-quarter bit period

4. Takeover: The slave drives a LOW level after the falling edge for ttko(slv)

5. Data: The slave sends two data bytes

6. Handover: The slave sends a handover bit that is a logic 0 and disables the output

after a three-quarter bit period

7. Takeover: The master drives a LOW level after the falling edge for ttko(mas)

8. Stop condition: The master drives a rising edge after a LOW level

Figure 25 shows the read access of the digital interface. The signal OWI represents

the data on the bus from the master or slave. The signals: master output enable and

slave output enable indicate when the master or the slave output is enabled or disabled,

respectively.

001aag744

master

output

enable

slave

output

enable

START

CMD7

CMD0

RDATA0

(1)

(2)

(4)

(5)

(3)

HANDSHAKE

RDATA15

IDLE

STOP

OWI

1. Duration of LOW level for slave takeover ttko(slv).

2. The master output enable and the slave output enable overlap, because both drive a LOW

level. However this behavior ensures the independency from having a pull-up or pull-down on

the bus. In addition, it improves the EMC robustness, because all levels are actively driven.

3. Duration of LOW level for master takeover ttko(mas).

4. If the master does not take over, the pull-up generates the stop condition. Otherwise a

timeout is generated if there is a pull-down and the slave waits for a rising edge as start

condition.

5. If the master does not drive the bus, the bus-pull defines the bus.

Figure 25. OWI read access

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