AT94K40AL-25BQC Atmel, AT94K40AL-25BQC Datasheet - Page 42

• Manufacturer Part Number: AT94K40AL-25BQC
• Description: IC FPSLIC 40K GATE 25MHZ 144LQFP
• Manufacturer: Atmel
• Series: FPSLIC®r

Specifications of AT94K40AL-25BQC

• Core Type: 8-bit AVR
• Speed: 18MHz
• Interface: I²C, UART
• Program Sram Bytes: 20K-32K
• Fpga Sram: 18kb
• Data Sram Bytes: 4K ~ 16K
• Fpga Core Cells: 2304
• Fpga Gates: 40K
• Fpga Registers: 2862
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 144-LQFP
• For Use With: ATSTK594 - BOARD FPSLIC DAUGHTER FOR STK500
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

4.4.2
4.4.3
4.4.4
42
AT94KAL Series FPSLIC
External Clock
No Clock/Oscillator Source
Timer Oscillator
To drive the device from an external clock source, XTAL2 should be left unconnected while
XTAL1 is driven as shown in
Figure 4-2.
When not in use, for low static IDD, add a pull-down resistor to XTAL1.
Figure 4-3.
For the timer oscillator pins, TOSC1 and TOSC2, the crystal is connected directly between the
pins. The oscillator is optimized for use with a 32.768 kHz watch crystal. An external clock signal
applied to this pin goes through the same amplifier having a bandwidth of 1 MHz. The external
clock signal should therefore be in the range
0 Hz – 1 MHz.
Figure 4-4.
External Clock Drive Configuration
No Clock/Oscillator Connections
Time Oscillator Connections
C
C
R
1
2
PD
Figure
NC
OSCILLATOR
EXTERNAL
4-2.
SIGNAL
R
NC
XTAL2
XTAL1
GND
B
R
S
TOSC2
TOSC1
R
XTAL2
XTAL1
GND
PD
= 4.7 KΩ
C
C
R
R
1
2
B
S
= 33 pF
= 27 pF
= 10M
= 200K
1138I–FPSLI–1/08