Linx Technologies LICAL-ENC-HS001 - Manual (Page 14)

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Using the Optional Encoder PIN
Creation of an Encoder PIN
1. Set the CREATE line high, then low to enter
Create PIN Mode. The MODE_IND line
begins toggling high / low until either a PIN is
successfully entered or 15 seconds has passed.
2. To enter the PIN, set high then low a sequence
of any four data lines. The MODE_IND stops
toggling and the PIN is created.
3. To cancel the Create PIN Mode prior to the
fourth entry, either wait for the 15 second
timeout to pass or set and clear the CREATE
line. The MODE_IND stops toggling and no PIN
is created.
4. If a new KEY is created, the PIN is automatically erased.
Using the PIN
1. The PIN is entered by setting each data line high, then taking it low
until all four entries have been made. There is a maximum 2-second
time limit between entries after which the PIN must be reentered in its
entirety.
2. Once the PIN is successfully entered, the encoder is operational unless
it is inactive for a period longer than what is chosen by the SEL_TIMER
line, in which case PIN reentry is necessary.
KEY IN
1
2
3
4
MODE_IND
CREATE
}
KEY IN
2
DATA OUT
MODE_IND
CREATE
}
Figure 15: Encoder PIN Setup
Recommended Pad Layout
The HS Series encoders and decoders are implemented in an industry
standard 20-pin Shrink Small Outline Package (20-SSOP). The
recommended layout dimensions are shown in Figure 16.
Production Considerations
These surface-mount components are designed to comply with standard
reflow production methods. The recommended reflow profile is shown in
Figure 17 and should not be exceeded, as permanent damage to the part
may result.
0.047
(1.19)
0.016
(0.41)
0.026
(0.65)
0.328 (8.33)
0.234 (5.94)
Figure 16: PCB Layout Dimensions
240°C Max
0
25
50
75
100
125
150
175
200
225
250
TEMPERATURE (°C)
275
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320
TIME (SECONDS)
340 360 380 420 400
260°C Max
Lead-Free
Sn / Pb
Figure 17: HS Series Reflow Profile