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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
8.3 OTP Programming Connection
Programming of the AS5030 OTP memory does not require a dedicated programming hardware. The programming can be simply accomplished
over the serial 3-wire interface (see Figure 22) or the optional 2-wire interface (see Figure 8) .
For permanent programming (command PROG OTP, #19 H ), a constant DC voltage of 8.0V ~ 8.5V ( ≥ 100mA) must be connected to pin #2
(PROG).
For temporary OTP write (“soft write”; command WRITE OTP, #1F H ), the programming voltage is not required.
To secure unintentional programming, any modification of the OTP memory is only enabled after a special password (command #10 H ) has been
sent to the AS5030.
Figure 22. OTP Programming Connection
+5 V
VDD
13
VDD
Output
11
CS
VDD
Micro
Controller
Output
I/O
10
12
CLK
DI O
AS5030
100n
8. 0 – 8.5V
2
PROG
VSS
10μF 100n
C1
14
C2
15
VSS
3
VSS
8.3.1
Programming in Daisy Chain Mode
Programming in Daisy chain mode is possible for both 3-wire and 2-wire mode (see Figure 17 and Figure 19 ). For temporary programming (soft
write), no additional connections are required. Programming is executed with the respective programming commands. For permanent
programming, the programming voltage must be applied on pin#2 (PROG) of the device to be programmed. It is also possible to apply the
programming voltage simultaneously to all devices, as the actual programming is only executed by a software command.
A parallel connection of all PROG-pins allows digital programming verification but does not allow analog programming verification.
If analog programming verification is required, each PROG pin must be selected individually for verification.
www.ams.com/AS5030
Revision 2.4
26 - 44
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