AT89EVK-01 Atmel, AT89EVK-01 Datasheet - Page 5

• Manufacturer Part Number: AT89EVK-01
• Description: KIT EVAL FOR AT83C24 FOR TDA8004
• Manufacturer: Atmel

Specifications of AT89EVK-01

• Main Purpose: Memory, Smart Card
• Utilized Ic / Part: AT83C24
• Processor To Be Evaluated: AT83C24
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2.1.6
2.1.7
2.1.8
AT89EVK-01 User Guide
TWI Link
External TWI Link
Board configuration
the TWI_SEL switch selects the polarity of the smart card presence: information on
PRES or on PRES\ (see §2.1.8). See Figure 4-1 on page 16 for TWI_SEL selection.
Figure 2-4. Power Supply Configuration
Remark:
The TWI link is managed by T89C5121. The program stored in the Flash memory con-
figures the AT83C24 registers once after the reset.
The T89C5121 sends TWI commands. The AT83C24 TWI address depends on level on
A2,A1,A0 pins at reset. The T89C5121 sends TWI commands at all addresses to avoid
any problem of level on A2, A1, A0 at reset.
If the user wants to use an external TWI source to configure the AT83C24, the 2 test
points SCL and SDA are used.
To avoid any conflict with T89C5121 signals, the T89C5121 software must check the
SW2 signal before to send data on SCL and SDA.
The table below describes the switches and solder pads configurations.
Table 2-2. Configuration Description
Solder pad
VCC and L1 must be connected to the same voltage.
or Switch
SW11
SW1
SW2
SW5
SW4
SW9
Configuration
TWI_SEL = 0
VDD TDA8004 (3.3V or 5V)
with solder
no solder
no solder
Default
solder
EVCC
Description
RFU (TDA8004AT)
Smart card presence detection:
TWI_SEL = 0: PRES indicates the smart card presence.
TWI_SEL = 1: PRES\ indicates the smart card presence.
Reset button
Used for clock configuration (see §2.1.2)
Used to connect TDA8004 clock on A2 (transparent
mode). Use firmware from version 3 (at89evk01_V3.zip)
Used to connect a pull up resistor on RESET pin
AT83C24
VCC
VDDP TDA8004 (5V)
LI
L1
Hardware Description
4325C–SCR–09/04
2-7