IC-MPEVALMP1D datasheet(12/22 Pages) ICHAUS

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iC-MP 8-BIT HALL ANGLE ENCODER

WITH RATIOMETRIC OUTPUT

Rev B1, Page 12/22

PROGRAMMING MODE

When pulling the VZAP pin to high during startup,

the programming mode is entered (see ’OPERATING

MODES’). In this mode there are three different cate-

gories of operation:

• Write ROM Mode (V(VZAP) = Vzap(), according to

ELEC.CHAR., no. 507):

In Write ROM Mode each Zener zap diode is burned

(= zapped) immediately on the rising edge of MA.

See Figure 13 for details. For the conditions of oper-

ation of Write ROM Mode, see ELEC.CHAR., ’Zap-

ping Input VZAP’.

• Write RAM Mode (V(VZAP) = VDD):

In Write RAM Mode the iC-MP reacts as in Write

ROM Mode but there is no zapping of the Zener zap

diodes. This mode can be used to temporarily pro-

gram iC-MP (non-permanent) for test purpose.

• Read ROM (V(VZAP) = VDD):

In Read ROM Mode the content of the Zener zap

diodes is read out. A Read ROM operation over-

writes iC-MP’s RAM content.

Figure 11: Serial timing of Read ROM Mode

Figure 12: Serial timing of Write RAM Mode

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