ECOG1XE01A6 CYAN, ECOG1XE01A6 Datasheet - Page 50

• Manufacturer Part Number: ECOG1XE01A6
• Description: IC, 16BIT MCU, ECOG1X, 70MHZ, QFN-68
• Manufacturer: CYAN

Specifications of ECOG1XE01A6

• Controller Family/series: ECOG1X
• No. Of I/o's: 20
• Ram Memory Size: 8KB
• Cpu Speed: 70MHz
• No. Of Timers: 8
• Digital Ic Case Style: QFN
• Core Size: 16 Bit
• Program Memory Size: 64KB
• Embedded Interface Type: I2C, JTAG, SPI, UART
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Version 1.15
Applications Information
Connections
50
For normal operation, the following recommendations should be observed in the hardware design.
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The external quartz crystal used with the 8MHz high reference oscillator requires two load
capacitors. The maximum load capacitance value for the high reference oscillator is 32pF,
including any package and stray capacitance due to the circuit board layout. The recommended
load capacitor value is 22pF. Higher load capacitor values increase slightly the power
consumption of the oscillator circuit.
If an external clock source is used instead of the 8MHz quartz crystal oscillator, then
High_XTAL_Out is not connected and the external clock signal is connected to High_XTAL_In.
If the high reference clock is not required, then High_XTAL_Out is not connected and
High_XTAL_In is connected to AGND via a 10kΩ resistor.
The external quartz crystal used with the 32.768kHz low reference oscillator requires two load
capacitors. The maximum load capacitance value for the low reference oscillator is 25pF,
including any package and stray capacitance due to the circuit board layout. The recommended
load capacitor value is 10pF. Higher load capacitor values increase slightly the power
consumption of the oscillator circuit.
If an external clock source is used instead of the 32.768kHz quartz crystal oscillator, then
Low_XTAL_Out is not connected and the external clock signal is connected to Low_XTAL_In.
If the low reference clock is not required, then Low_XTAL_Out is not connected and
Low_XTAL_In is connected to AGND via a 10kΩ resistor.
On smaller package variants (68QFN, 100QFN), the nReset pin is bidirectional. It is driven low
internally as an open-collector output by the on-chip power-on reset supply voltage sense circuit,
and is also connected as an input to the device from the pin. This allows the use of an external
reset circuit if required. The nReset input has a Schmitt trigger input circuit.
On larger package variants (208BGA), the nReset_Out and nReset_In pins are not connected
internally. This allows the use of an external reset circuit if required. A power-on reset signal must
be connected to nReset_In (active low) for correct operation of the device, either from the internal
reset circuit or from an external power-on reset circuit. To use the internal power-on reset circuit,
connect nReset_Out to nReset_In, either directly or via external logic for any additional external
reset source such as a pushbutton switch. The nReset_In input has a Schmitt trigger input circuit
and an internal pull-up resistor. The nReset_Out output is open-drain with an internal pull-up
resistor, and can be used in a wired-OR connection with an external power-on reset if the external
device also has an active-low open-drain output.
eCOG and CyanIDE are registered trademarks of Cyan Holdings plc
Figure 2: High reference oscillator external components
Figure 3: Low reference oscillator external components
eCOG1X Microcontroller Product Family
www.cyantechnology.com
4 August 2009