DB62 Datasheet, PDF (4/6 Pages) Cirrus Logic – DEMONSTRATION BOARD FOR SA305EX

DB62
EVALUATION KIT FOR
SA305EX
ASSEMBLY
Before starting the assembly, please review the special con-
siderations section to be able to differentiate between required
and recommended components. The assembly instructions
below cover all the components in the board irrespective of
whether they are required or optional. Use the bread board-
ing area for any additional circuitry (example: pull-up for hall
sensors) that might be required.
1. Note that each side of the circuit board is identified as either
the “component side” or “bottom side.” The component side
is labeled on the silk screen side of the board. Cut the MS11
strip into strips of 12 and 11. Discard the remaining small
strip of 7. Insert the two strips into the two rows of holes
for the DUT from the component side of the PCB. From
the bottom side, solder all cage jacks to the circuit board
pads. Be sure that the cage jacks are fully seated before
soldering. Be careful that the solder does not flow into the
cage jack. Remove the plastic carrier strips.
2. From the component side, solder a jumper between SGND
and DGND and another between PGND and DGND.
3. From the component side, solder the surface mount capaci-
tors, C1, C4, C7 and C11 and resistors R5 and R10.
4. From the component side, solder jumpers into place for
the following components: R12, R14, R15, R27, R28 and
R29.
5. From the component side, solder pin sockets into place
for the following components: C5, C8, C10, R8, J1A (2 pin
sockets), J1B, J2A, J2B, J3A, J3B and DGND.
6. Study the DIP28 socket and notice the notch on one end.
From the component side, insert the socket, making sure
that the socket has the same orientation as the silk screen
diagram. Solder in the socket from the bottom side.
7. Solder one end of an insulated jumper wire to Pin 11 of the
DIP28 socket, and plug the other end into one of the two
pin sockets at J1A.
8. From the component side, insert the potentiometers VDUC
and VFREQ in the specified orientation and solder from the
bottom side. Carefully bend the potentiometers down to a
horizontal position.
9. From the component side, insert switches SW1 and SW2
and solder from the bottom side.
10. From the component side, insert White Test Points into
TP1, TP2, PWM_HC1, PWM_HB1 and PWM_HA1.
Insert Black Test Points into PWM_LC1, PWM_LB1 and
PWM_LA1. Solder all test points from the bottom side.
11. From the component side, insert the following components:
R1, R2, R3, R6, R7, R11, R17, R20, R26, R22, R21, R18,
R23, R24 and R25, and solder from the bottom side.
12. From the component side, insert LED’s D7, D9, D12, D11,
D10 and D8 and solder from the bottom side.
13. If Hall Effect Sensor pull-up resistors are necessary, install
resistors in bread board to the left of the HALL_A, HALL_B
and HALL_C sockets.
14. Install pin socket in bread board directly under DGND pin
socket.
15. From the component side, insert the 4MM PCB sockets.
Note that there are 4 Black sockets, for SGND, DGND,
PGND and OFF. There are 5 Red sockets, for VPWR,
VDD2, VDD, FAULT and WARNING. The remaining 10
White sockets are for the remaining Input/Output signals.
Solder all sockets from the bottom side.
16. From the component side, insert Schottky diodes D1, D2,
D3, D4, D5 and D6. Solder from the bottom side. Do NOT
trim off excess lead length at this time.
17. If Hall Sensor pull-up resistors are to be used, at this time,
on the bottom side, connect wires from HALL_A, HALL_B,
HALL_C and VDD to the appropriate bread-board sockets
as determined in Step 13.
18. On the bottom side, connect a wire from OFF PCB connec-
tor to pin socket directly under DGND pin socket (installed
in Step 14).
19. On the bottom side, connect 16-gauge wire from D4 cath-
ode to AOUT PCB connector. Connect another 16-gauge
wire from D6 cathode to COUT PCB connector. Connect
a third 16-gauge wire from D5 cathode to BOUT PCB
connector. Now, trim off the excess lead length from the
Schottky diodes.
20. From the component side, insert the snubber resistors,
R13, R16 and R19, and solder from the bottom side. Insert
snubber capacitors, C5, C8 and C10 into the previously
installed pin sockets.
21. From the component side, insert the electrolytic capacitors,
C12 and C2, and solder from the bottom side.
22. Install jumper as desired for J3A and/or J3B. Install jumper
from J1A to J1B. If desired, jumper J2A and J2B.
23. Using appropriate hardware, install stand-offs at each
corner hole.
24. Clip the SA305 into the HS32 heat sink with the CLAMP05
clip. Carefully insert the part with the heat sink into the
MS11 sockets. Bolt the heat sink in from the bottom side
of the board using the holes provided on the PCB.
Soft-Start Feature:
A soft start algorithm has been developed so that the
duty cycle at start-up is low and the motor ramps up to the
specified speed reference. The startup duty cycle should be
programmed so that the over current limit of the SA305 is not
exceeded at start-up. The algorithm enables controlling the
rate of acceleration and consequently the maximum current.
When the motor is to be reversed the soft-start algorithm is
once again initiated, causing the motor to gradually accelerate
in the opposite direction. Please refer to application note 45
for details on the soft-start algorithm.
Fault Reset:
The SA305 requires an external reset pulse at the disable
pin to resume normal operation when the part is in a latched
fault condition because of Short-circuit, Over Temperature
(>160°C) or Over-Current (>10 A). In the DB62 board, there
is a provision to reset the part automatically without human
intervention. A jumper needs to be connected between J1A
and P11 of MCU as shown in the schematic. When a fault
occurs, an interrupt is generated which in turn starts generat-
ing pulses at P11 to reset the SA305.
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