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, • Write RAM Mode (V(VZAP) = VDD):
the programming mode is entered (see ’OPERATING
MODES’). In this mode there are three different cate-
gories of operation:
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):
• Write ROM Mode (V(VZAP) = Vzap(), according to
ELEC.CHAR., no. 507):
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.
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’.
1
fc l k ()
tpr >
th > 0m s
tp r
t > 50µ s
PSMI
VZA P= Vtl( )hi
th
VDD
tp r
MA
S
T
A
R
T
S
L
I
X
D
0
X
D
1
D
5
0
X
D
5
1
X
N
E
R
R
Figure 11: Serial timing of Read ROM Mode
t
>
4
0
µ
s
1
fc l k ( )
t
p
r
>
t
h
>
0
m
s
t > 50 µ s
th
t
p
r
P
S
M
I
t
>
4
0
µ
s
V
Z
A
P
=
V
t
l
(
)
h
i
VD D
MA
t
p
r
D0
X
D 1
X
D 50
X
D
5
1
S
T
A
R
T
S
L
I
X
X
X
X
X
N
E
R
R
Figure 12: Serial timing of Write RAM Mode
ICHAUS [ IC-HAUS GMBH ]
