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AS5145

Datasheet - Application In form atio n

9.1.6 Redundant Programming Option

In addition to the regular programming, a redundant programming option is available. This option allows that one selectable OTP bit can be set

to “1” (programmed state) by writing the location of that bit into a 5-bit address decoder. This address can be stored in bits RA4...RA0 in the OTP

user settings.

Example: setting RA4…0 to “00001” will select bit 51 = PWhalfEN_Indexwidth, “00010” selects bit 50 = MagCompEN, “10010” selects bit 34

=CCW, etc.

9.1.7 OTP Register Entry and Exit Condition

For timing options, refer to Programming the AS5145 (page 19).

Figure 13. OTP Access Timing Diagram

To avoid accidental modification of the OTP during normal operation, each OTP access (Load, Write, Read, Program) requires a defined entry

and exit procedure, using the CSn, PDIO and CLK signals as shown in Figure 13.

Figure 14. OTP Programming Connection

OTP Access

Setup Condition

Operation Mode Selection

Exit Condition

CSn

PDIO

CLK

AS5145 Demoboard

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

MagDECn

DTest1_A

DTest2_B

NC

Mode_ Index

VSS

PDIO

DO

CLK

CSn

PWM

NC

NC

VDD3V3

VDD5V

AS 5 145

IC 1

7

2

3

4

5

6

1

10n

2.2µF

µC

Cap only required for OTP programming

GND

PROG

CSN

DO

CLK

5VUSB

VDD3V3

VSS

+

10µF

2

3

1

GND

VSS

VPROG

3.3 …4. 6 V

only required for

OTP programming

connect to USB

interface on PC

For programming,

k eep these 6 wires

as short as possible!

max. length = 2 inches (5cm)

22k

3V 3