HCS410 datasheet(22/36 Pages) MICROCHIP

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HCS410

DS40158C-page 22

Preliminary

3.7.5

MTX3: MINIMUM CODE WORDS

COMPLETED

If this bit is set, the HCS410 will transmit a minimum of

3 words before it powers itself down. If this bit is

cleared, the HCS410 will only complete the current

transmission. This feature will only work if VDD is con-

nected directly to the battery as shown in Figure 2-1.

3.7.6

VLOW: LOW VOLTAGE TRIP POINT

The low voltage trip point select bit is used to tell the

HCS410 what Vdd level is being used. This information

will be used by the device to determine when to send

the voltage low signal to the receiver. When this bit is

set, the Vdd level is assumed to be operating from a 5

volt or 6 volt supply. If the bit is cleared, then the Vdd

level is assumed to be 3.0 volts. Refer to Figure 5-3 for

voltage trip point. When the battery reaches the Vlow

point, the LED will ﬂash once for 200 ms on during a

code hopping transmission.

3.7.7

LED: OUTPUT ENABLE

If this bit is set, the S2 doubles as an LED output line.

If this bit is cleared (0), S2 is only used as an input.

3.7.8

TBSL: TRANSPONDER BAUD RATE

SELECT

This option selects the baud rate for IFF communica-

tion between a TE of 100

µs or 200 µs.

3.7.9

MANCH: MANCHESTER CODE

ENCODING

MANCH selects between Manchester code modulation

and PWM modulation in code hopping mode. If

MANCH = 1, Manchester code modulation is selected.

If MANCH is cleared, PWM modulation is selected.

3.7.10

ACOLI: ANTI-COLLISION

COMMUNICATION AND

XPRF: TRANSPONDER ECHOING

ON PWM OUTPUT

ACOLI = 1, XPRF = 0

If ACOLI is set the anti-collision operation during bi-

directional transponder mode (IFF) is enabled. This

feature is useful in situations where multiple transpon-

ders enter the magnetic ﬁeld simultaneously.

ACOLI = 0, XPRF = 1

If XPRF is set, and ACOLI is cleared, proximity activa-

tion is enabled. the HCS410 starts sending out ACK

pulses when it detects a magnetic ﬁeld. If the HCS410

doesn’t receive a start bit from the decoder within 50

ms of sending the ﬁrst set of ACK pulses, the HCS410

will transmit a code hopping transmission on LC and

PWM pins for 2 seconds.

ACOLI = 1, XPRF = 1

If both the ACOLI and XPRF are set, all of the HCS410

transponder responses are echoed on the PWM out-

put, as described in Section 2.6.2.

3.7.11

DINC: DELAYED INCREMENT

If DINC is set to ‘1’, the delayed increment feature is

enabled. If DINC is cleared, the counter only incre-

ments once each time the button is pressed.

3.7.12

XSER: EXTENDED SERIAL NUMBER

If XSER is set, the full 64-bit SEED number is

transmitted. If XSER is cleared, the four most signiﬁ-

cant bits of the serial number are substituted by

S[2:0] = S2:S1:S0: 0 and is compatible with the

HCS200/300/301.

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