HCS101T-I/SN Microchip Technology, HCS101T-I/SN Datasheet - Page 7

• Manufacturer Part Number: HCS101T-I/SN
• Description: IC ENCODER FIXED CODE 8-SOIC
• Manufacturer: Microchip Technology
• Type: Fixed Code Encoderr

Specifications of HCS101T-I/SN

• Applications: Remote Control
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.0
When using the HCS101 in a system, the user will have
to program some parameters into the device, including
the serial number and the counter, before it can be
used. The programming cycle allows the user to input
a 192-bit serial data stream which is then stored inter-
nally in EEPROM. Programming will be initiated by
forcing the DATA line high after the S2 line has been
held high for the appropriate length of time. Refer to
Table 6-1 and Figure 6-1.
After the Program mode is entered, a delay must be
provided to the device for the automatic bulk write cycle
to complete. This will write all locations in the EEPROM
to all zeros. The device can then be programmed by
clocking in 16 bits at a time, using S2 as the clock line
and DATA as the data in line. After each 16-bit word is
loaded, a programming delay is required for the internal
program cycle to complete. This delay can take up to
Twc.
FIGURE 6-1:
FIGURE 6-2:
©
(Clock)
Note: S0 and S1 button inputs to be held to ground during the entire programming sequence.
(Data)
DATA
2001 Microchip Technology Inc.
S2
(Clock)
(Data)
DATA
Note: If a Verify operation is to be done, then it must immediately follow the Program cycle.
S2
PROGRAMMING THE HCS101
Enter Program
T
Bit190
Programming Cycle
PS
Mode
T
Bit191
PH
End of
1
T
PH
PROGRAMMING WAVEFORMS
VERIFY WAVEFORMS
2
T
T
WC
PBW
T
Bit 0
CLKH
T
CLKL
Bit 1 Bit 2
Begin Verify Cycle Here
T
DS
Bit 0
T
Bit 3
DH
Preliminary
Repeat 12 times for each word
Bit 1 Bit 2 Bit 3
T
Bit 14 Bit 15
DV
Initiate Data Polling Here
T
Write Cycle
Complete Here
Data in Word 0
CLKL
The HCS101 will signal that the write is complete by
sending out a train of ACK pulses, T
low on DATA. The ACK pulses will continue until S2 is
dropped. These times can be used to calculate the
oscillator calibration value. The first pulse’s width
should NOT be used for calibration.
At the end of the programming cycle, the device can be
verified as shown in Figure 6-2 by reading back the
EEPROM. Reading is done by clocking the S2 line and
reading the data bits on the DATA pin. A verify opera-
tion can only be done once, immediately following
the program cycle.
T
Note:
WC
Bit 14
To ensure that the device does not acci-
dentally enter Programming mode, DATA
should never be pulled high by the circuit
connected to it. Special care should be
taken when driving PNP RF transistors.
Bit 15
Calibration Pulses
Bit 16 Bit 17
HCS101
ACKH
Bit190 Bit191
DS41115C-page 7
Bit 16 Bit 17
Data for Word 1
high, T
ACKL