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AS5030

Datasheet - Application In formatio n

8.2.4 18-bit OTP Write Commands

During the 18bit OTP read/write transfer, each bit needs 4 clock pulses to be validated.

WRITE OTP:

non-permanent (“soft write”) modification of the OTP register. To set the reserved factory settings area properly, a preceding READ

OTP command must be made to receive the correct setting for bits D17:D10. The WRITE OTP command must then set these bits in exactly the

same way. Improper setting of the factory settings by a WRITE OTP command may cause malfunction of the chip. The OTP register, including

the factory settings can be restored to default by a power-up cycle.

For non-permanent writing, a programming voltage at pin PROG (#2) is not required. EN_PROG must be sent before WRITE_OTP to enable

OTP.

PROG OTP:

permanent modification of the OTP register. An unprogrammed OTP bit contains a ‘0, programmed bits are 1’s. It is possible to

program the OTP in several sequences. However, only a 0 can be programmed to 1. Once programmed, an OTP bit cannot be set back to 0. For

subsequent programming, bits that are already programmed should be set to 0 to avoid double programming.

During permanent programming, the factory settings D17:D10 should always be set to zero to avoid modification of the factory settings.

Modifying the factory settings may cause irreversible malfunction of the chip.

For permanent programming, a static programming voltage of 8.0-8.5V must be applied at pin PROG (#2). EN_PROG must be sent before

PROG_OTP to enable OTP.

sens

sets the sensitivity setting of the Hall elements:

00: gain factor = 1.65 (low sensitivity)

01: gain factor = 1.75

10: gain factor = 1.86

11: gain factor = 2.00 (high sensitivity)

zero position

sets the user programmable zero position; the actual angle of the magnet which is displayed as 000

Figure 21. Timing Diagram in OTP 18-bit Read/Write Mode

Command

Bin

Hex D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7

D6

D5

D4

D3

D2

D1

D0

WRITE

OTP

11111

1F

copy factory settings

obtained from READ OTP command

sens

1:0

zero position

7:0

PROG OTP 11001

19

00000000

reserved for factory settings,

sens

1:0

zero position

7:0

HI

HI

CMD0

DCLK

CS

DIO

t0

t2

t5

t3

t4

DIO

t6

Command phase

Data phase extended

D17

DIO

CMD2

D17

D16

D16

t7

t8

t11

t12

t10

READ

t13

WRITE

t1

t9

D0

D0