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Example packets are shown in Figure 10 with all lines set in a speciﬁc state.

Figure 11 shows the timings associated with the Holtek

protocol.

Input Type Selection

The DS Series is designed to be operable with Holtek

encoders and

decoders, but there is one key condition. The Holtek

encoders and

decoders have tri-state input lines but the DS has bi-state lines. Tri-state

inputs are connected to ground for zero bits, V

for one bits, or left

unconnected for open bits. Since the DS cannot match this operation

the D_CFG, A_CFG0 and A_CFG1 lines are provided to select the desired

interpretation. The settings must match on both ends.

Pulling D_CFG high conﬁgures the data inputs as one and zero. A high on

a data line is interpreted as a one bit and a low on the line is interpreted

as a zero bit. Pulling D_CFG low conﬁgures the data inputs as one and

open. A high on a data line is interpreted as a one bit and a low on the line

is interpreted as an open bit. The decoder outputs open data bits as logic

low. This is shown in Figure 12.

A_CFG0 and A_CFG1 are used to select the bit type for the address lines.

These are shown in Figure 13.

Products that need to operate with the older Holtek products need to

set these conﬁguration lines according to how the Holtek

encoders and

decoders are implemented in the product.

D_CFG Conﬁguration

Conﬁguration Bit Interpretation

D_CFG High Low

0 One Open

1 One Zero

A_CFGO and A_CFG1 Conﬁguration

Conﬁguration Bit Interpretation

A_CFG1 A_CFG0 High Low

0 0 One Zero

0 1 One Open

1 0 Open Zero

1 1 One Zero

Figure 12: D_CFG Conﬁguration

Figure 13: A_CFG0 and A_CFG1 Conﬁguration

Check

< 1 Word

3 Words

Transmitted Continuously

3 Words

Decoder

Data Out

Decoder VT

Encoder

Data Out

Encoder

Transmit

Enable

2 Words

SYNC BITS

A&D BITS

PULLED TO

VCC

ADDRESS BITS DATA BITS

A&D BITS

OPEN

A&D Bits

PULLED TO

GND

SYNC

PERIOD

SYNC BITS A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 D0 D1 D2 D3 D4 D5 D6 D7

Figure 10: Holtek

Protocol Timing

Figure 11: DS Series Timing

1 2 3 4 5 6 7 8 9 10 11 12 13

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