參數(shù)資料
型號(hào)： HTCM400
廠商： NXP Semiconductors N.V.
英文描述： HITAG core module hardware
中文描述： 此外，HITAG核心模塊的硬件
文件頁(yè)數(shù)： 7/24頁(yè)
文件大?。?/td> 112K
代理商： HTCM400
2001 Oct 04
7
Philips Semiconductors
Product specification
HITAG core module hardware
HTCM400
7.1.5
B
EHAVIOUR WITH SEVERAL TRANSPONDERS
If several HITAG transponders arrive simultaneously
within the communication field of the antenna of a HITAG
proximity reader module, the ‘stronger’ transponder (the
nearer one) takes over or - under special circumstances -
no communication takes place. If the transponders arrive
in the field one after the other, communication is
established with the first one, all other transponders are
ignored.
Nevertheless, it is possible to mute transponders so that
several HITAG transponders can be accessed
sequentially. This ensures that no two (or several) HITAG
transponders will ever be processed (above all written to)
accidentally at the same time.
If a HITAG long range reader module is used, anticollision
mode is applied, which makes it possible to read and write
all the HITAG 1 transponders (theoretical up to 2
32
) within
the communication field of the antenna simultaneously.
Because of the mutual influence of the transponder coils -
they detune each other if there are too many too close to
each other - the number of the transponders that can be
operated simultaneously is limited.
7.2
Core module software
The software description is given in document “HTCM400,
HTRM440 Family, HTRM800 Family Interface Protocol
Reader - Host”.
7.3
Core module hardware
7.3.1
EEPROM
The EEPROM is used to store non-volatile data such as
personalization data, keys, passwords, configurations and
status information.
7.3.2
M
ICROCONTROLLER
The microcontroller processes the protocol for the
communication between the transponders and the read
and write unit. The interface signals are converted so that
a HITAG 1 or HITAG 2 transponder is able to process
them and the outgoing signals from the transponder are
converted into interface-compatible signals.
The second essential microcontroller function is its control
function.Themicrocontrolleractivatesanddeactivatesthe
transmitter and selects the EEPROM.
7.3.3
I
NTERFACE
:
MICROCONTROLLER
-
HOST
The device communicates with the host (microcontroller or
PC) via a serial interface using a baud rate of 9600 baud.
Data transfer details are: 1 start bit, 8 data bits, 1 stop bit
and no parity bit, the least significant bit is sent first.
An RS232 interface device can be connected to the
HTCM400. Optionally an RS422 or an RS485 device is
possible.
7.3.4
T
RANSMITTER AND RECEIVER
The transmitter receives data from the microcontroller and
modulates the carrier.
The receiver demodulates the received data and passes
them on to the microcontroller for further processing.
7.3.5
A
NTENNA
For the design of HITAG proximity antennas, see
Section 11.
7.3.6
HITAG
LONG RANGE READER MODULE
The HITAG long range reader module (HTRM800)
supplied by Philips uses some of the module pins as
interface to an additional high frequency part and a Digital
Signal Processor (DSP) part.
7.3.7
I
NTERFACE
:
MICROCONTROLLER
- HITAG
LONG
RANGE BOARD
This interface is not wired with proximity applications
(leave pins open).
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