IC-MHL200 Datasheet, PDF (30/33 Pages) IC-Haus GmbH – 12-BIT LINEAR / ROTARY POSITION HALL ENCODER

iC-MHL200
12-BIT LINEAR / ROTARY POSITION HALL ENCODER
100 nF
100 nF
VPD VPA
VZAP
MA
iC-MHL200 _SLI
SLO
VND VNA
100 nF 10 µF
Programming
Board
+ 5V
+ 7V
Serial
Interface
0V
Rev C1, Page 30/33
Figure 30: Recommended setup for external program-
ming. A short low impedance path (shown in
light red) must be provided directly from pin
VZAP to pin VNA
Figure 31: Example PCB layout showing low impedance
connection of capacitors to supply voltages
(VPA, VPD, VZAP) and common ground
The ROM content may be protected against further
changes by register CFGPROT.
For reliable ROM writing, a low impedance connection
path as shown in Figure 30 must be established for
the VZAP blocking capacitor (about 100 nF) between
pin VZAP and pin VNA to ensure stable VZAP voltage
during programming. A further capacitor of 10 µF which
may be located externally (e.g. on the programming
board) is recommended for additional blocking purpose.
CFGPROT
Value
0
1
Note
Addr. 0x05; bit 6
Protection
no protection
write/read protection
The VZAP voltage must not be applied.
Table 36: Write/read protection of configuration
A typical PCB layout may look like the one shown in
Figure 31.
With CFGPROT = 0, the registers at the addresses 0x00
to 0x0F and 0x78 to 0x7F are readable and writeable.
The addresses 0x10 to 0x1F and 0x77 are read-only.
With CFGPROT = 1, the address 0x7C is writeable. The
addresses 0x42, 0x43 and 0x76 to 0x7F are readable,
while all others are read-protected.