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PDF SAA7806 Data sheet ( Hoja de datos )
| Número de pieza | SAA7806 | |
| Descripción | One Chip CD Audio Device | |
| Fabricantes | NXP Semiconductors | |
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SAA7806
One chip automotive CD audio device
Rev. 01 — 20 June 2005
Objective data sheet
1. General description
The SAA7806, is a single chip solution CD audio decoder, digital servo, audio DAC,
pre-amp, laser driver and integrated ARM7TDMI-S microcontroller, targeted at automotive
CD applications. The channel decoder design is derived from the SAA7817 DVD decoder
IC, with optimization and design improvements specifically for CD audio (e.g. improved
CD playability). The digital servo, analog pre-amp, laser driver and audio DAC blocks are
improved designs based on the SAA7824 CD decoder IC. Further architectural
enhancements to the design have been made to integrate system functionality and reduce
the system cost of ownership. The SAA7806 IC supports a generic architecture that will
form the basis of future variants in the SAA7806 IC family optimized for different CD
applications.
2. Features
2.1 Hardware features
s Channel decoder based on SAA7817 IC design
s Digital servo based on SAA7824 IC design
s 32-bit embedded ARM7 RISC microcontroller supporting both 32-bit and 16-bit Thumb
instruction sets
s Mask programmed internal program ROM for microcontroller
s Register structure redesigned to utilize the complete 32-bit bandwidth of the integrated
microcontroller bus architecture
s Programmable clock frequency for ARM microcontroller - allowing users to trade-off
power consumption and processing power depending on requirements
s Microcontroller access to digital representations of the diode input signals from the
optical pick up; the microcontroller can also generate the servo output signals RA, FO,
SL and allows the possibility of additional servo algorithms or a complete servo
implementation in software
s Microcontroller access to audio streams; both from the internal CD decoder and an
external stereo auxiliary input (e.g. an analog source from a tuner; converted to digital
via on-chip ADCs) to allow audio processing algorithms in the ARM microcontroller;
e.g. bass boost and volume control
s Two general purpose analog inputs (A_IN_1 and A_IN_2) allowing the ARM
microcontroller access to other external analog signals; e.g. low cost keypad;
temperature sensor; via on-chip ADCs
s Two analog inputs for external audio sources (e.g. tuner) which can be accessed by
the ARM for audio processing
s Slave I2S-bus mode in which the channel decoder can synchronize the CD playback
speed to an input I2S-bus clock
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Philips Semiconductors
SAA7806
One chip automotive CD audio device
5.2 Pin description
9397 750 13697
Objective data sheet
Table 2: Pin description
Symbol
Pin
VSS(DACF)
VSS(DACB)
BUF_OUT_L
1
2
3
BUF_OUT_R
4
VDDA3
A_IN_1/GPIO0
5
6
A_IN_2/GPIO1
7
TX/GPIO_ANA
8
RX/GPIO_ANA
9
SDA
10
SCL 11
VSSD1
RESET_N
12
13
VDDD1
LKILL
14
15
RKILL
16
VSSP1
DOBM
17
18
VDDP1
SEG0/GPIO4
19
20
SEG1/GPIO5
21
SEG2/GPIO6
22
SEG3/GPIO7
23
SEG4/GPIO8
24
SEG5/GPIO9
25
SEG6/GPIO10
26
SEG7/GPIO11
27
SEG8/GPIO12
28
SEG9/GPIO13
29
VLCD
SEG10/GPIO14
30
31
SEG11/GPIO15
32
SEG12/GPIO16
33
SEG13/GPIO17
34
SEG14/GPIO18
35
VDD(LED)
SEG15/GPIO19
36
37
SEG16/GPIO20
38
SEG17/GPIO21/CL1 39
Type
P
P
AO
AO
P
AIBTS
AIBTS
AIBTS
AIBTS
B
B
P
IUH
P
BTSU
BTSU
P
OS
P
AIBTS
AIBTS
AIBTS
AIBTS
AIBTS
AIBTS
AIBTS
AIBTS
AIBTS
AIBTS
P
AOBS
AOBS
AOBS
AOBS
AOBS
P
AOBS
AOBS
AOBS
Description
audio DAC floating ground
audio DAC and buffer shared ground
audio buffer left output
audio buffer right output
positive supply voltage 3 for audio buffer
analog input 1 or general purpose I/O 0
analog input 2 or general purpose I/O 1
UART transmit or general purpose I/O
UART receive or general purpose I/O
I2C-bus interface data I/O line (open drain output)
I2C-bus interface clock line
digital core ground 1
Power-on reset (active LOW)
digital core supply 1
kill output for left channel (configurable as open drain)
kill output for right channel (configurable as open drain)
digital ground 1 for periphery (pads)
biphase mark output (no external buffer required)
digital supply 1 for periphery (pads)
LCD segment drive or general purpose I/O 4
LCD segment drive or general purpose I/O 5
LCD segment drive or general purpose I/O 6
LCD segment drive or general purpose I/O 7
LCD segment drive or general purpose I/O 8
LCD segment drive or general purpose I/O 9
LCD segment drive or general purpose I/O 10
LCD segment drive or general purpose I/O 11
LCD segment drive or general purpose I/O 12
LCD segment drive or general purpose I/O 13
LCD supply voltage (5 V supply)
LCD segment drive or general purpose I/O 14
LCD segment drive or general purpose I/O 15
LCD segment drive or general purpose I/O 16
LCD segment drive or general purpose I/O17
LCD segment drive or general purpose I/O18
LED supply voltage (3.3 V supply)
LCD segment drive or general purpose I/O 19
LCD segment drive or general purpose I/O 20
LCD segment drive or general purpose I/O 21 or clock
output for sampling channel decoder telemetry outputs
Rev. 01 — 20 June 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
5 of 73
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Philips Semiconductors
SAA7806
One chip automotive CD audio device
Sys_clk is the primary clock used by the channel decoder and ARM clock generators. This
clock operates at 67 MHz with either an 8 MHz or 16 MHz crystal or resonator. The
divide-by-2 is selected when a 16 MHz crystal or resonator is used.
6.3 General purpose analog inputs
The two general-purpose ADC inputs (A_IN_1, pin 6 and A_IN_2, pin 7) can be used for
giving the ARM microcontroller access to external analog sources, e.g. for monitoring
temperature and to provide simple resistor-ladder keypad functionality. These inputs use
an additional pair of sigma-delta ADCs identical to those used for the LF diode inputs.
The general purpose analog inputs have separate interrupt request lines and use address
space in the servo registers for storing the converted digital values. The output of the
general-purpose ADCs are low-pass filtered and can have fine offset compensation
added before being passed to a decimation filter. The digital values from the decimation
filter are then captured in the servo registers with 10-bit resolution per channel. See
Figure 6.
reg 2F8 for A_IN_1
reg 2FC for A_IN_2
DC OFFSET
COMPENSATION
reg 318 for A_IN_1
reg 31C for A_IN_2
FINE DC OFFSET
COMPENSATION
A_IN_1
or
A_IN_2
6 or 7
SIGMA-DELTA
ADC
LOW-PASS
FILTER
INTERRUPT
GENERATOR
DECIMATION
FILTER
IRQ
SERVO
REGISTERS
(10-BIT)
to ARM microprocessor
001aab750
Fig 6. General purpose analog inputs block diagram
6.4 Auxiliary analog inputs
Two further analog inputs, AUX_L and AUX_R, are available with sufficient resolution for
inputting external audio sources, e.g. for allowing ARM access to an external audio source
for sound processing algorithms.
This allows audio processing of external audio sources via the AUX pins, whilst
simultaneously using the general purpose inputs for keyboard and temperature inputs.
Since these two inputs share one pair of the LF sigma-delta ADCs used in the LF path (for
inputs D1 and D2) a multiplexer is used to control the data source into the ADCs. For this
reason, D1 and D2 cannot be used at the same time as AUX_IN_L and AUX_IN_R. A
further multiplexer is used to switch the input pads from the headphone input buffer modes
9397 750 13697
Objective data sheet
DataSheet4 U .com
Rev. 01 — 20 June 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
11 of 73
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| PDF Descargar | [ Datasheet SAA7806.PDF ] | |
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