- 您现在的位置：买卖IC网 > PDF目录385871 > ST7285C (意法半导体) 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES PDF资料下载
参数资料
| 型号： | ST7285C |
| 厂商： | 意法半导体 |
| 英文描述： | 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES |
| 中文描述： | 8位微控制器48,000铁路发展策略光盘，3K内存，ADC，两个定时器，2个SPI，I2C和脊髓损伤接口 |
| 文件页数： | 67/117页 |
| 文件大小： | 748K |
| 代理商： | ST7285C |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页当前第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页
67/117
ST7285C
RDS FILTER (
Cont’d)
4.7.2 Functional Description
The RDS filter is of classical Switched Capacitor
type, comprising: an anti-aliasing filter, the SC-fil-
ter proper and a smoothing filter connected in cas-
cade. The block diagram is given inFigure 33.
The Filter peripheral is composed of the following
functional blocks:
–
Prefilter
. The anti-aliasing filter consists of a 2
nd
order Sallen-Key filter. The phase response in
the passband is linear. The cut-off frequency is
located at about 360KHz. The prefilter includes
an operational amplifier with a gain of 80 dB.
–
SC Filter
. The SC filter is a 8
th
order bandpass
filter. It comprises 4 cascaded biquads. The bi-
quads all have the same scheme and differ only
in their capacitor values. The switches are con-
trolled by a clock generator which produces non-
overlapping clock phases.
–
Buffer
. The output of the SC-Filter cannot be
connected to resistive loads, since this would se-
verely reduce its gain. A buffer is therefore con-
nected between the SC filter and the smoothing
filter.
–
Smoothing filter
. The smoothing filter connect-
ed to the Sc-filter (through the Buffer) is a simple
RC low pass filter. The output is connected to
RDSFIL pin (external connection) and to the
Comparator.
–
Comparator
. The comparator is connected to
the smoothing filter and is able to detect zero-
crossing in less than 125ns. The digital output of
the comparator is connected via a port to the
RDS demodulator.
–
D/A Converter
. A maximum offset of 1mV is al-
lowed on the comparator’s inputs. The offset
compensation is achieved as follows:
in a software selectable test mode, the input of
the filter is switched to RDSREF (=2.5V). The D/
A converter register (RDSFi1) is set to zero and
then incremented by software until the compara-
tor changes its sign.
–
Test Mode Selector
. This function is controlled
via 4 bits in the filter control register (RDS Fi2). It
selects the various test modes. (see next point).
– ST7 interface registers.
These are described
below.
RDS Fi1
Address 005Ah:
—
Read/Write Register
b7 = reserved.
b6 =
COMP
Comparator output (read only).
b5-0 =
AD5-AD0
Offset
correction
(1LSB=2mV).
value
output
by
D/A
RDS Fi2
Address 005Bh
—
Read/Write Register
b7-5 = reserved.
b4 =
PDB
Power down bit (1 = Run; 0 = Power-down)
b3-0 =
TM3-TM0
Mode select. Only Modes shown in the table below
are valid; other modes are reserved.
When the internal filter is switched off, the RDS-
COMP pin can be used as an input and to feed the
demodulator from an external filter.
7
6
5
4
3
2
1
0
-
COMP
AD5
AD4
AD3
AD2
AD1
AD0
7
6
5
4
3
2
1
0
-
-
-
PDB
TM3
TM2
TM1
TM0
TM3
0
0
TM2
0
0
TM1
0
1
TM0
0
1
Mode
filter off (reset state)
normal operating mode
offset compensation
mode
1
1
0
1
相关PDF资料 |
PDF描述 |
|---|---|
| ST72T85A5Q6 | 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES |
| ST730C08L3 | PHASE CONTROL THYRISTORS |
| ST730C08L3L | PHASE CONTROL THYRISTORS |
| ST730C12L0 | PHASE CONTROL THYRISTORS |
| ST730C12L0L | PHASE CONTROL THYRISTORS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST7-28B56 | 功能描述:电源变压器 SPLIT BOBBIN HORZ MOUNT XFMR RoHS:否 制造商:Triad Magnetics 功率额定值:12 VA 初级电压额定值:115 V / 230 V 次级电压额定值:12 V / 24 V 安装风格:SMD/SMT 一次绕组:Dual Primary Winding 二次绕组:Dual Secondary Winding 长度:2.5 in 宽度:2 in 高度:1.062 in |
| ST72A | 制造商:DGS 功能描述: |
| ST72C104G1B6 | 功能描述:8位微控制器 -MCU Flash 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C104G1M1 | 制造商:STMicroelectronics 功能描述:8-BIT MICROCONTROLLER - Bulk |
| ST72C104G1M6 | 功能描述:8位微控制器 -MCU Flash 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。