ks8701 Samsung Semiconductor, Inc., ks8701 Datasheet - Page 20

• Manufacturer Part Number: ks8701
• Description: Flextm Roaming Decoder Ii
• Manufacturer: Samsung Semiconductor, Inc.

KS8701
OFD: Oscillator Frequency Difference. These bits describe the maximum difference in the frequency of the
PCE:
SP:
SME: Synchronous Mode Enable. When this bit is set, a Status Packet will be automatically sent whenever
MOT: Maximum Off Time. This bit has no effect if AST in the Timing Control Packet is non-zero. When
76.8 kHz oscillator crystal with respect to the frequency of the transmitter. These limits should be the
worst case difference in frequency due to all conditions including but not limited to aging, temperature,
and manufacturing tolerance. Using a smaller frequency difference in this packet will result in lower
power consumption due to higher receiver battery save ratios. Note that this value is not the absolute
error of the oscillator frequency provided to the KS8701. The absolute error of the clock used by the
FLEX transmitter must be taken into account. (e.g. If the transmitter tolerance is +/- 25 ppm and the
76.8 kHz oscillator tolerance is +/-140 ppm, the oscillator frequency difference is +/- 165 ppm and OFD
should be set to 0.)(value after reset=0)
partial correlation is enabled, the KS8701 will shutdown the receiver before the end of the last FLEX
block which contains addresses if it can determine that none of the addresses in that FLEX block will
match any enabled address in the KS8701. When this bit is cleared, the receiver will be controlled as it
was in previous versions of the IC.(value after reset=0)
The polarity of the EXTS0 and EXTS1 bits will be determined by the receiver design.
the SMU (synchronous mode update) bit in the Status Packet is set. The host can use the SM
(synchronous mode) bit in the Status Packet as an in-range/out-of-range indication. (value after
reset=0)
AST=0 and MOT=0, asynchronous A-word searches will time-out in 4 minutes. When AST=0 and
MOT=1, asynchronous A-word searches will time-out in 1 minute. (value after reset=0)
Signal Polarity. These bits set the polarity of EXTS1 and EXTS0 input signals. (value after reset=0)
Partial Correlation Enable. When this bit is set, partial correlation of addresses is enabled. When
SP
0
0
1
1
1
OFD
SP
0
1
0
1
0
0
1
1
0
1
Inverted
Inverted
Normal
Normal
Signal Polarity
EXTS1 EXTS0
OFD
0
1
0
1
FLEX
0
TM
Inverted
Inverted
Normal
Normal
Roaming Decoder II
Frequency Difference
+/- 300 ppm
+/-150 ppm
+/- 75 ppm
+/- 0 ppm
Modulation
@SP = 0, 0
+4800 Hz
+1600 Hz
-1600 Hz
-4800 Hz
FSK
Host-to-Decoder Packet Descriptions
EXTS1
1
1
0
0
EXTS0
0
1
1
0
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