HCS410-IP Microchip Technology, HCS410-IP Datasheet - Page 22

• Manufacturer Part Number: HCS410-IP
• Description: KEELOQ CODE HOPPING ENCODER AND TRANSPONDER
• Manufacturer: Microchip Technology

HCS410
3.7.5
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 V
nected directly to the battery as shown in Figure 2-1.
3.7.6
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
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
This option selects the baud rate for IFF communica-
tion between a T
3.7.9
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.
DS40158C-page 22
MTX3: MINIMUM CODE WORDS
COMPLETED
V
LED: OUTPUT ENABLE
TBSL: TRANSPONDER BAUD RATE
SELECT
MANCH: MANCHESTER CODE
ENCODING
LOW
: LOW VOLTAGE TRIP POINT
E
of 100 s or 200 s.
DD
is con-
Preliminary
3.7.10
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
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
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.
ACOLI: ANTI-COLLISION
COMMUNICATION AND
XPRF: TRANSPONDER ECHOING
ON PWM OUTPUT
DINC: DELAYED INCREMENT
XSER: EXTENDED SERIAL NUMBER
1997 Microchip Technology Inc.