908E425 Datasheet, PDF (39/49 Pages) Freescale Semiconductor, Inc – Integrated Quad Half H-Bridge with Power Supply, Embedded MCU, and LIN Serial Communication

TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
DEVELOPMENT SUPPORT
As the 908E425 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 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 pcb board.
CHIP LEVEL PROGRAMMING
On Chip level the easiest way is to only power the MCU
with +5.0 V (see Figure 23) and not to provide the analog
chip with V_SUP, in this setup all the analog pinpin 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 described in the MC68HC908EY16
datasheet - section development support. Of course its also
possible to supply the whole system with Vsup (12 V) instead
as described in Figure 24, page 40.
+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 MMMM99008E6425
VSSA
EVSS
9.8304MHz CLOCK
CLK _PTC4/OSC1
DATA _PTA0/KBD0
10k
PTB4/AD4
+5V
10k
PTA1/KBD1
10k
PTB3/AD3
Figure 23. Normal Monitor Mode Circuit (MCU only)
Analog Integrated Circuit Device Data
Freescale Semiconductor
908E425
39