908E624_10 Datasheet, PDF (31/40 Pages) Freescale Semiconductor, Inc – Integrated Triple High Side Switch with Embedded MCU and LIN Serial Communicationfor Relay Drivers

TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
DEVELOPMENT SUPPORT
As the 908E624 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
terminal, but IRQ_A terminal
• MCU monitoring (Normal request timeout) has to be
disabled
For a detailed information on the MCU related
development support see the MC68HC908EY16 data sheet -
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 18) and not to provide the analog chip
with VSUP, in this setup all the analog terminal should be left
open (e.g. VSUP[1:2]) and interconnections between MCU
and analog die have to be separated (e.g. IRQ - IRQ_A).
This mode is well described in the MC68HC908EY16 data
sheet - section development support.
VDD
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
VDD
10k
VSUP[1:2]
GND
VDD
AGND
+5V
VREFH
RST
VDDA
RST_A
EVDD
100nF
VTST
IRQ
VREFL
MM908E624
VSSA
IRQ_A
EVSS
9.8304MHz CLOCK
CLK _PTC4/OSC1
DATA _PTA0/KBD0
10k
PTB4/AD4
10k
PTA1/KBD1
10k
PTB3/AD3
WDCONF
4.7µF
+5V
Figure 18. Normal Monitor Mode Circuit (MCU only)
Of course it is also possible to supply the whole system
with VSUP (12 V) instead as described in Figure 19, page 32.
Analog Integrated Circuit Device Data
Freescale Semiconductor
908E624
31