908E626_12 Datasheet, PDF (32/43 Pages) Freescale Semiconductor, Inc – Integrated Stepper Motor Driver with Embedded MCU and LIN Serial Communication

TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
DEVELOPMENT SUPPORT
As the 908E626 has the MC68HC908EY16 MCU
embedded, typically all the development tools available for
the MCU also apply for this device. However, due to the fact
of the additional analog die circuitry and the nominal +12 V
supply voltage some additional items have to be considered:
• nominal 12 V rather than 5.0 V or 3.0 V supply
• high voltage V_TST might be applied not only to IRQ pin,
but also the IRQ_A pin
For a detailed information on the MCU related
development support, see the MC68HC908EY16 datasheet -
section, development support.
The programming is principally possible at two stages in
the manufacturing process - first on chip level, before the IC
is soldered onto a pcb board, and second, after the IC is
soldered onto the pc board.
Chip level programming
At the Chip level, the easiest way is to only power the MCU
with +5.0 V (see Figure 16), and not provide the analog chip
with VSUP. In this setup, all the analog pins should be left
open (e.g. VSUP[1:3]), and interconnections between the
MCU and the analog die have to be separated (e.g. IRQ -
IRQ_A).
This mode is well described in the MC68HC908EY16
datasheet - section, development support.
+5V
RS232
DB-9
2
3
5
1 _C1+
1µF ⁺
VCC ¹⁶
3 _C1-
GND ¹⁵
4 _C2+
V+ ²
1µF ⁺
V- ⁶
5 _C2- ^MAX232
+ _1µF
1µF
+
1µF
+
7 T2_OUT
8 R2_IN
T2IN 10
74HC125
R2OUT 9 2
3
1
74HC125
6
5
4
+5V
10k
VSUP[1:3]
VDD
GND[1:2]
VSS
+5V
VREFH
RST
RST_A
VDDA
EVDD
100nF
4.7µF
VTST
IRQ
VREFL
IRQ_A MM908E626
VSSA
EVSS
9.8304MHz CLOCK
CLK _PTC4/OSC1
DATA _PTA0/KBD0
10k
PTB4/AD4
+5V
10k
PTA1/KBD1
10k
PTB3/AD3
Figure 16. Normal Monitor Mode Circuit (MCU only)
It is also possible to supply the whole system with V_SUP
(12 V) instead as described in Figure 17.
PCB level programming
If the IC is soldered onto the pc board, it is typically not
possible to separately power the MCU with +5.0 V. The
whole system has to be powered up providing V_SUP (see
Figure 17).
908E626
32
Analog Integrated Circuit Device Data
Freescale Semiconductor