SSM2163_15 Datasheet, PDF (16/16 Pages) Analog Devices – Digitally Controlled 8 3 2 Audio Mixer

SSM2163
number stored in LEVEL_VALUE is the attenuation value,
OUTLINE DIMENSIONS
expressed in –dB, so larger values will decrease volume. Also,
Dimensions shown in inches and (mm).
the register must not be allowed to increment beyond 7FH
because the MSB will be set and the SSM2163 will interpret
the value as an address. Therefore, the two highest bits of
LEVEL_VALUE should be cleared by ANDing the register
28-Pin Plastic DIP
(N-28)
with 3FH.)
1.565 (39.70)
If the µC’s hardware serial port is being user for other purposes,
the SSM2163 can be loaded by using the parallel port. A typical
parallel interface is shown in Figure 31. The serial data is
1.380 (35.10)
28
15
0.580 (14.73)
0.485 (12.32)
transmitted to the SSM2163 via the 80C51’s Port 1.6 output,
1
14
while Port 1.5 acts as the serial clock.
PIN 1
0.060 (1.52)
0.015 (0.38)
0.625 (15.87) 0.195 (4.95)
0.600 (15.24) ^{0.125 (3.18)}
0.250
OBSOLETE ^P1.6
DATA IN
P1.5
CLK
P1.4
80C51 µC
P1.3
+5V
10k
WRITE
LD
SSM2163
SYSMUTE
NOTE: ADDITIONAL PINS OMITTED FOR CLARITY
Figure 31. An SSM2163 to 80C51 µC Interface Using
Parallel Port 1
Software for the interface of Figure 31 is straightforward.
Typically, the µC will repeatedly shift the value to be sent, for
example from register LEVEL_VALUE, into the carry bit. Port
P1.6 is then set or reset based on the carry bit, and Port P1.5 is
(6.35)
MAX
0.200 (5.05) _{0.022 (0.558)}
0.125 (3.18) _{0.014 (0.356)}
0.100
(2.54)
BSC
0.070
(1.77)
MAX
0.150
(3.81)
MIN
SEATING
PLANE
28-Pin SOIC
(R-28)
0.7125 (18.10)
0.6969 (17.70)
29
15
1
14
0.015 (0.381)
0.008 (0.204)
strobed low and then high to create a clock pulse. After eight
loops, the value will have been sent to the SSM2163. Note that
PIN 1
all eight bits should be sent, even though only six bits are
0.1043 (2.65)
0.0926 (2.35)
0.0291
0.0098
(0.74)
(0.25)
x
45°
significant. If only six bits are shifted in, the two low order bits
of the previous value will remain in the MSBs of the shift
register. If this action results in the MSB being a one, the
SSM2163 will interpret this as an address and unpredictable
0.0118 (0.30)
0.0040 (0.10)
0.0500
(1.27)
BSC
0.0192 (0.49)
0.0138 (0.35)
SEATING
PLANE
8°
0.0125 (0.32) ^0°
0.0091 (0.23)
0.0500 (1.27)
0.0157 (0.40)
results will occur.
–16–
REV. 0