參數(shù)資料
型號(hào)： PCD5008H
廠商： NXP SEMICONDUCTORS
元件分類： 尋呼電路
英文描述： FLEX Pager Decoder
中文描述： TELECOM, PAGING DECODER, PQFP32
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, SOT-358-1, LQFP-32
文件頁(yè)數(shù)： 17/64頁(yè)
文件大?。?/td> 341K
代理商： PCD5008H
1998 Jun 17
17
Philips Semiconductors
Product specification
FLEX
Pager Decoder
PCD5008
8.4.4
C
ONFIGURATION PACKET
(ID = 01H)
The configuration packet defines a number of different
configuration options for the PCD5008. The PCD5008
ignores this packet when decoding is enabled,
i.e. the ON bit in the control packet is set (Table 11).
OFD:
oscillator frequency difference (Tables 4 and 5).
These bits represent the maximum frequency difference
between the 76.8 kHz oscillator (accounting for ageing,
temperature variation, manufacturing tolerance etc.) and
the worst case transmitter bit rate (specified in FLEX
as
±
25 parts per million (ppm), see Section 15.3.1).
For example, if the transmitter tolerance is
±
25 ppm and
the 76.8 kHz oscillator tolerance is
±
140 ppm, the
transmitter-oscillator frequency difference is
±
165 ppm
and OFD should be cleared (300 ppm max.). Value after
reset = 0. Note that configuring a smaller frequency
difference in this packet results in lower power
consumption due to higher receiver battery save ratios.
SME:
synchronous mode enable (Table 5). When this bit
is set, a status packet is sent automatically whenever the
synchronous mode update (SMU) bit in the status packet
is set. This happens whenever a change occurs in the
synchronous mode (SM) status bit, which indicates that
the decoder is synchronized to a FLEX
data stream.
The host can use the SM bit in the status packet as an
in-range/out-of-range indication. Value after reset = 0.
MOT:
maximum off time (Table 5). When this bit is set, the
PCD5008 assumes that there can be up to 1 minute
between transmitted frames on the paging system. When
this bit is clear, the PCD5008 assumes that there can be
up to 4 minutes between transmitted frames on the paging
system. This setting is determined by the service provider.
Value after reset = 0.
COD:
clock output disable (Table 5). When this bit is clear,
a 38.4 kHz signal is output on the CLKOUT pin. When this
bit is set, the CLKOUT pin is driven HIGH. Note that
setting and clearing this bit can cause pulses on the
CLKOUT pin that are less than one half the 38.4 kHz
period. Also note that when the clock output is enabled, the
CLKOUT pin always outputs the 38.4 kHz signal even
when the PCD5008 is in reset. Value after reset = 0.
MTE:
minute timer enable (Table 5). When this bit is set,
a status packet is sent at one minute intervals with the
minute time-out (MT) bit in the status packet set. When
this bit is clear, the internal 1-minute timer stops counting.
See Section 8.4.8 for details of 1-minute timer operation.
Value after reset = 0.
LBP:
low battery polarity (Table 5). This bit defines the
polarity of the PCD5008’s LOBAT pin: When this bit is set,
a HIGH at input LOBAT represents a low battery condition.
The LB bit in the status packet is initialized to the inverse
(i.e. inactive) value of the LBP bit when the PCD5008 is
turned on (by setting the ON bit in the control packet).
When the PCD5008 is turned on, the first low battery
update in the status packet is sent to the host when a low
battery condition is detected on the LOBAT pin. Value
after reset = 0.
SP:
signal polarity (Tables 5, 6 and 7). These bits set the
polarity of EXTS1 and EXTS0 input signals. The polarity of
the EXTS1 and EXTS0 bits is determined by the receiver
design. Value after reset = 0.
Table 4
Maximum oscillator frequency difference
OFD
1
OFD
0
FREQUENCY DIFFERENCE
(ppm)
±
300
±
150
±
75
±
0
0
0
1
1
0
1
0
1
Table 5
Configuration packet bit assignments
BYTE
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
OFD
1
SP
1
0
OFD
0
SP
0
0
SME
MOT
COD
MTE
LBP
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCD5008HBD-T 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication Decoder
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PCD5013H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:FLEX roaming decoder II
PCD5032 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ADPCM CODEC for digital cordless telephones
PCD5032B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Linear CODEC
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