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) = V
zap
(), 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
ICHAUS [ IC-HAUS GMBH ]
