Datasheet

ADS7817
15
SBAS066A
FIGURE 11. Motor Control Using an Isolated ADS7817.
R
SENSE
from
PWM
from
PWM
AC Motor
1st Motor Leg
To 3rd Motor
Leg
To 2nd Motor
Leg
CS
D
OUT
CLK
R
5
200Ω
R
6
200Ω
ADS7817
+V
ISO1
+V
CC
V
REF
V
REF
+V
CC
Opto-Couplers
(1)
NOTE: (1) Suggested Opto-couplers are HCPL-2611 or
HCPL-7611. Inverters or buffers will be needed to drive
these devices. See the appropriate Hewlett-Packard data
sheet for more information.
REF1004-1.2
R
1
+5V
R
2
768Ω
R
3
301Ω
+150mV
R
4
43.2Ω
C
2
4.7µF
+
C
4
0.01µF
C
1
4.7µF
+
C
3
0.1µF
WST
Motorola
DSP56004
SDO0
SDO1
SDO2
SCKT
SCKR
SDI0
SDI1
WSR
SCK/SCL
MISO/SDA
MOSI/HA0
HREQ
SS/HA2