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參數(shù)資料
| 型號： | 935263011112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, SOT-162, SO-16 |
| 文件頁數(shù)： | 29/33頁 |
| 文件大小： | 574K |
| 代理商： | 935263011112 |
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Philips Semiconductors
PCD3316
CIDCW receiver
Product specication
11 March 1999
5 of 30
9397 750 04824
Philips Electronics N.V. 1999. All rights reserved.
Unrestr
icted
They can be used for ring or line polarity reversal detection. The POL on/off bit (Mode
register 1, bit 4) must be set to enable generation of an interrupt when a polarity
change occurs. The result of the two comparators can be read in bits 7 and 6 (POL0
and POL1) of the Status register (see Section 7.4). The 3.58 MHz clock is not needed
for the generation of a polarity interrupt.
7.2 CAS detection
After a power-on reset or after enabling the CAS detector the internal registers of the
CAS detection function are initialized. The initialization takes a maximum of
100 periods of the 3.58 MHz clock.
If the CAS detection is enabled the PCD3316 will generate an interrupt (Interrupt
register, bit 1 is set) when a correct dual tone (2130 and 2750 Hz) is detected.
Interrupts will be blocked when the signal level on the CAS input is below the
threshold in the level detector.
7.3 FSK reception
The FSK receiver function can be enabled by setting the FSK on/off bit (Mode
register 1, bit 7).
In the FSK transmission specication of BT and Bellcore a channel seizure is
transmitted rst (sequence of 1010..). After the channel seizure a block of marks and
nally the data pattern are sent (see Figure 3). These mark bits are detected by the
PCD3316 which sets the FSK-BOM Indication bit (Status register, bit 4). The
FSK-BOM Indication bit is reset when the FSK receiver is disabled.
If the FSK-BOM Indication bit is set, the FSK receiver will generate an interrupt after it
has received a complete data word. An FSK data word consists of one start bit
(space), followed by eight data bits and one stop bit (mark). Interrupts will therefore
not be generated during the channel seizure and during the block of marks. When a
valid data word has been received, FSK data is available in the FSK data register.
By clearing the FSK-BOM-mask on/off bit (Mode register 1, bit 6), the FSK receiver
will not wait with the generation of interrupts until a Begin Of Mark (BOM) has been
detected but will handle the channel seizure as normal data. The block of marks
which is a string of logic 1 will still not generate interrupts because there are no start
bits.
After the generation of an interrupt the IRQ pin will become active (see Figure 4), and
the FSK Interrupt bit is set (Interrupt register, bit 5). The received data is available in
the FSK data register.
Fig 3.
FSK transmission specication.
width
MBH979
channel seizure
mark
FSK transmission
FSK-BOM
data
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