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PDF SC14422 Datasheet ( Hoja de datos )

Número de pieza SC14422
Descripción Complete Baseband Processor for DECT Base Stations
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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SC14422 Hoja de datos, Descripción, Manual
PRELIMINARY
March 1998
SC14422
Complete Baseband Processor for DECT Base Stations
General Description
Preliminary document version 1.1.
The SC14422 is a 3.0 Volt CMOS IC optimized to handle
all the audio, signal and data processing needed within a
DECT basestation. An ADPCM transcoder, a very low
power CODEC and Analog Frontend are integrated. Di-
rect connections towards analog or ISDN line interface.
The SC14422 is designed to be compatible with many
radio interfaces. A dedicated TDMA controller handles all
physical layer slot formats and radio control.
The integrated National Semiconductor’s standard
CR16A processor core with external Program memory
(Flash or ROM) takes care of all the higher protocol stack.
Programmable I/O ports can be configured as chip selects
for I/O expanders, Serial Flash memory, interrupt source
or I/O. A digital serial interface can be configured to inter-
face to many codecs and ISDN devices with µ-Law, a-Law,
linear or transparent data formats.
Features
s Integrated DECT base band transceiver optimized for
GAP base stations according to ETS 300 175-2, 175-3
& 175-8.
s 3.0 to 5.5 Volt operating voltage.
s Embedded 16 bit CompactRISCTM CR16A Microproc-
essor with In System Emulation (ISE) mode.
s 2k + 4kbyte Data Memory.
s Two full duplex 32 kbits/sec ADPCM transcoder.
s 14-bit linear CODEC with programmable gain
s Serial interface to external codecs and ISDN interface
circuits.
s Echo canceller, two echo suppressors, DTMF genera-
tor, sidetone and artificial echo loss.
s On-chip gaussian Modulator.
s Peak hold ADC for RSSI measurement
s Three input 8 bit successive approximation ADC.
s On board programmable Dedicated Instruction Proces-
sor (DIP) for all TDMA based events.
s Protected and unprotected half, full and double slot B-
fields D00, D08, D32 and D80
s Standard DECT encryption with different keys for
different MAC-connections.
s 6 MAC connections can be handled simultaneously.
s Flexible three wire interface to radio front synthesizer.
s Three general purpose I/O ports with programmable in-
terrupts.
s General purpose full duplex UART.
s SPITM and MICROWIRETM interfaces.
s Two general purpose timers and watchdog timer.
s Programmable chip selects to 8 bit wide ROM, SRAM
NAND Flash Memory and I/O expanders.
s Capture timer for frequency measurement for e.g. me-
tering, ringing and call progress tone detection.
s 100 pin TQFP-100 package.
________________________________________________________________________________________________
System Diagram
SC14401
SC14402
SC14422
ISDN or
PSTN
PSTN
Interface ISDN
SC14401
SC14402
SC14402
4220030
SPITM is a trademark of Motorola, MICROWIRETM and CompactRISCTM are trademarks of National Semiconductor Corporation
Copyright 1998 National Semiconductor Corp.
1
www.national.com

1 page

SC14422 pdf
Table 1: Pin Description)
PIN NAME
P1[5] or
HOLDACKn
P1[6] or
ISE
P1[7] or
READY
VDD
VSS
P2[0] or
PWM
P2[1] or
Buzzer+
P2[2] or
Buzzer-
P2[3] or
STR0
P2[4] or
STR1
TP
ICLK
COUT
CIN
TONE
P2[5] or
ADC0/DAC0
P2[6] or
ADC1
P2[7] or
ADC2
Vref+
MIC+
AGND
MIC-
Vref-
LRS-
LRS+
AVD2
AVS2
DAC
CAP
Xtal1
VSS
VDD
NR TYPE DESCRIPTION
36 2 INPUT/OUTPUT with selectable pull up resistor. General purpose memory
mapped I/O port bit. This pin can be configured as active low HOLD acknowledge.
In Emulation mode HOLDACKn is automatically selected.
37 2 INPUT/OUTPUT with selectable pull up resistor. General purpose memory
mapped I/O port. In development mode this pin generates an ISE interrupt to the
CR16A core if high.
38 4 INPUT/OUTPUT with open drain with 100 mA sink capability. If P1[7] is configured
as READY pin then if HOLDn is ‘1’, this pin will become low upon a read or write
access by an external processor. Can be used to control a LED connected to VDD..
39 Digital supply voltage.
40 Digital ground.
41 4 INPUT/OUTPUT with open drain with 100mA sink capability. This pin can also be
configured as single ended buzzer driver.
42 1 INPUT/OUTPUT. General purpose memory mapped I/O port bit. P2[1,2] can be
configured as complementary PWM output for e.g. buzzer control. P2[1,2] can
drive 12 mA.
43 1 INPUT/OUTPUT. General purpose memory mapped I/O port bit. P2[1,2] can be
configured as complementary PWM output for e.g. buzzer control. P2[1,2] can
drive 12 mA.
44 1 INPUT/OUTPUT. General purpose memory mapped I/O port bit.
OUTPUT External interface strobe 0.
45 1 INPUT/OUTPUT. General purpose memory mapped I/O port bit.
INPUT/OUTPUT. External interface strobe STR1.
46 1 INPUT. Testpin
47 1 INPUT/OUTPUT. External interface clock. On rising edge data is valid.
48 4 INPUT/OUTPUT. External interface data input, codec output. If output, this pin is
configured as an open drain. If the internal codec is used (format 1) an external pull
up resistor is required.
49 1 INPUT/OUTPUT. PCM interface data output, codec input
50 1 INPUT. TONE input to capture timer (e.g. metering tones)
51 5/analog DIGITAL OUTPUT/ANALOG INPUT. General purpose input to 8 bit ADC. 8 bit DAC
if ADC0,1,2 are not selected. P2[5] can also be used as a digital output.
52 5/analog DIGITAL OUTPUT/ANALOG INPUT. General purpose input one to 8 bit ADC
P2[6] can also be used as a digital output.
53 5/analog DIGITAL OUTPUT/ANALOG INPUT. General purpose input two to 8 bit ADC.
P2[7] can also be used as a digital output.
54 analog OUTPUT. Positive microphone reference voltage.
55 analog INPUT. Microphone positive input.
56 analog Signal ground output.
57 analog INPUT. Microphone negative input.
58 analog OUTPUT. Negative microphone reference voltage.
59 analog OUTPUT. Negative loudspeaker output.
60 analog OUTPUT. Positive loudspeaker output
61 Analog supply.
62 Analog ground.
63 analog OUTPUT. 8 bit DAC output e.g. for frequency control
64 analog External capacitor for crystal oscillator.
65 analog INPUT. 10.368 MHz crystal connection.
66 Digital ground.
67 Positive supply voltage.
Copyright 1998 National Semiconductor Corp.
5
www.national.com

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