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AS5030
Datasheet - A p p l i c a t i o n I n f o r m a t i o 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.
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
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
DCLK
Command phase
Data phase extended
CS
t0
t1
t9
DIO
DIO
t2
t3
HI
HI
t4
CMD2
t5
t6
CMD0
D17
t8
D16
t7
D0
t10
READ
DIO
t11
D17
t12
D16
D0
t13
WRITE
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