KMA215,118 Datasheet KMA215,118 | P31-P33

Product data sheet Rev. 1 — 24 February 2014 31 of 50

NXP Semiconductors

KMA215

Programmable angle sensor with SAE J2716 SENT

A more detailed description of all customer accessible registers is given in Section 13.5.

Both default value and the complete command including the address and write or read

request are also listed.

13.3.1 Write access

To write data to the non-volatile memory, perform the following procedure:

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

2. Command: The master sends a write command, that is the last bit is not set

(CMD0 = 0)

3. Data: The master sends two data bytes

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

Figure 18

shows the write 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.

Note: As already mentioned in Section 13.1, use the write procedure to enter the

command mode. If command mode is not entered, communication is not possible and the

sensor operates in normal operation mode. After changing an address, the time t

prog

must

elapse before changing another address. After changing the content of the non-volatile

memory, recalculate and write the checksum (see Section 13.4

4 to 1 CMD[4:1] address bits

0 CMD0 read/write

0 = write

1 = read

Table 31. Command byte bit description

…continued

Bit Symbol Description

(1) Missing rising edges generate a time-out condition and the written data is ignored.

(2) If the master does not drive the bus, the bus-pull defines the bus.

Fig 18. OWI write access

001aag743

master

output

enable

slave

output

enable

START CMD7 CMD0 STOP

(1)

(2)

IDLEWDATA15 WDATA0

OWI

Product data sheet Rev. 1 — 24 February 2014 32 of 50

NXP Semiconductors

KMA215

Programmable angle sensor with SAE J2716 SENT

13.3.2 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 t

tko(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 t

tko(mas)

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

Figure 19

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.

(1) Duration of LOW level for slave takeover t

tko(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 t

tko(mas)

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

Fig 19. OWI read access

001aag744

master

output

enable

slave

output

enable

START CMD7 CMD0 RDATA0

(1)

(2) (2) (4)

(5)

(3)

HANDSHAKE HANDSHAKERDATA15 IDLESTOP

OWI

Product data sheet Rev. 1 — 24 February 2014 33 of 50

NXP Semiconductors

KMA215

Programmable angle sensor with SAE J2716 SENT

13.3.3 Entering the command mode

After a power-on reset, the sensor provides a time slot t

cmd(ent)

for entering the command

mode. Keep OUT/DATA pin HIGH for at least t

and send a specific command sequence

(see Figure 20

). If command mode is not entered, the sensor starts in the normal

operation mode.

During the command mode sequence, the digital SENT output is enabled. The external

programming hardware has to overdrive the output with current I

. If command mode is

activated, the digital SENT output is disabled and pin OUT/DATA operates as a digital

bidirectional programming interface.

13.4 Cyclic redundancy check

As already mentioned in Section 7, there is an 8-bit checksum for the non-volatile memory

data. To calculate this value, the MSB of the memory data word generates the CRC at first

over all corresponding addresses in increasing order.

Read out all addresses from 0h to Eh for calculating the checksum. The Least Significant

Byte (LSB) of address Eh contains the previous checksum. Overwrite the value with 0h

before starting the checksum calculation.

The generator polynomial for the calculation of the checksum is:

(9)

With a start value of FFh and the data bits are XOR at the x

point.

Fig 20. OWI command mode procedure

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KMA215,118

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SENSOR ANGLE 180 DEG PC PIN

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