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908E626 Datasheet, PDF (30/38 Pages) Freescale Semiconductor, Inc – Integrated Stepper Motor Driver with Embedded MCU and LIN Serial Communication
TYPICAL APPLICATIONS
FACTORY TRIMMING AND CALIBRATION
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 +12V
supply voltage some additional items have to be considered:
• nominal 12V rather than 5V or 3V supply
• high voltage VTST might be applied not only to IRQ
terminal, but IRQ_A terminal
For a detailed information on the MCU related
development support see the MC68HC908EY16 datasheet -
section development support.
The programming is principially 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 pcb board.
Chip level programming
On Chip level the easiest way is to only power the MCU
with +5V (see Figure 15) and not to provide the analog chip
with VSUP, in this setup all the analog terminal should be left
open (e.g. VSUP[1:3]) and interconnections between MCU
and analog die have to be separated (e.g. IRQ - IRQ_A).
This mode is well descripted 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 T2OUT
8 R2IN
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 15. Normal Monitor Mode Circuit (MCU only)
Of course its also possible to supply the whole system with
Vsup (12V) instead as descibted in Figure 16, page 31.
PCB level programming
If the IC is soldered onto the pcb board its typically not
possible to seperately power the MCU with +5V, the whole
908E626
30
Analog Integrated Circuit Device Data
Freescale Semiconductor