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SPPDF-01 Development Suite
User’s Manual
Field Programmable
Coefficient Memory Access
Appendix C
Incorporation of the following circuit schematic into the OEM subassembly permits reprogram-
ming and modification of the SPPDM-01 with the SPPDF-01 Filter Coefficient Loader (FCL) soft-
ware utilizing MatLab
TM
V5.3 or V6.0 and an RS232 interface. Essentially, the circuit below mim-
ics the SPPDB-01.
Figure 10
Required circuit to provide coefficient memory access for the SPPDM-01 family
of products
The customer is responsible for obtaining manufacturer’s data sheets and listed components for
layout purposes. The only item that must be obtained from FDI is the SPPFP-01, 8-bit, 2k byte
preprogrammed micro-controller (U4). Contact factory for pricing and delivery.
Note: See Figure 10 for component location.
U4
SPPFP-01 - A
TM
EL AT89C2051 8-BIT, 2K byte preprogrammed micro-controller
U3
TI SN74CBTD3384 10 Bit Bus FET Switch
U5
MAXIM # MAX232AC - RS232 12 to 5 Volt Level Shifter (May not be required along
with its associated capacitors if U4 is connected to 5 volt logic.)
C11-16
4.7UF 20V 20% Tantalum
C17-18
33PF 50-100V 5 % (1206)
R12
8.25k 1/10W 1%
R13-14
4.75k 1/10W 1%
Y1
22.1184 MHz SMT Crystal ~18PF
32
