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AS5134
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Figure 17. OTP Programming Connection
Standard Case
Special Case
maximum
parasitic cable
inductance
V SUPPLY
V SUPPLY
V zapp
L<50nH
V prog
PROG
V DD
V zapp
L<50nH
V prog
PROG
V DD
C1
100nF
C2
10μF
GND
PROM Cell
C1
100nF
C2
10μF
GND
PROM Cell
Remove for normal operation
Note: The maximum capacitive load at PROG in normal operation is less than 20pF. However, during programming the capacitors C1+C2 are
needed to buffer the programming voltage during current spikes, but they must be removed for normal operation. To overcome this
contradiction, the recommendation is to add a diode (4148 or similar) between PROG and V DD as shown in Figure 17 (special case
setup), if the capacitors can not be removed at final assembly.
Due to D1, the capacitors C1+C2 are loaded with V DD -0.7V at startup, hence not influencing the readout of the internal OTP registers.
During programming the OTP, the diode ensures that no current is flowing from PROG (8-8.5V) to VDD (5V).
In the standard case (see Figure 17 ), the verification of a correct OTP readout can be done either by analog readback of the OTP reg-
ister or with the aid of the OTP_OK bit. The special case setup provides only the OTP_OK bit for verifying the correct reading of the
OTP. Analog readback is not usable in the special case mode, as the diode pulls the PROG pin to V DD .
The OTP_OK bit can be accessed with command #4 (see Table 9) .
As long as the PROG pin is accessible it is recommended to use standard setup. In case the PROG pin is not accessible at final
assembly, the special setup is recommended.
8.1.2
Programming Verification
After programming, the programmed OTP bits must be verified in two ways:
Digital Read Out (Mandatory): After sending a READ OTP command, the readback information must be the same as programmed
information. Otherwise, it indicates that the programming was not performed correctly.
Note: Either “Digital Verification” or “Analog Verification” must be carried out in addition to the “Digital Read Out”.
Digital Verification: Checking the OTP_OK bit (0 = OK, 1 = error)
i) At room temperature
ii) Right after the programming
Analog Verification: By switching into Extended Mode and sending a READ ANA command, the pin PROG becomes an output sending an
analog voltage with each clock representing a sequence of the bits in the OTP register (starting with D61). A voltage of <500mV indicates a
correctly programmed bit (“1”) while a voltage level between 2V and 3.5V indicates a correctly unprogrammed bit (“0”). Any voltage level in
between indicates incorrect programming.
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