ECOG1X5A5L CYAN, ECOG1X5A5L Datasheet - Page 53

• Manufacturer Part Number: ECOG1X5A5L
• Description: MCU, 16BIT, 512K FLASH, USB, 68QFN
• Manufacturer: CYAN

Specifications of ECOG1X5A5L

• Core Size: 16bit
• No. Of I/o's: 32
• Program Memory Size: 512KB
• Ram Memory Size: 24KB
• Cpu Speed: 70MHz
• Oscillator Type: External, Internal
• No. Of Timers: 5
• No. Of Pwm Channels: 2
• Rohs Compliant: Yes
• Controller Family/series: ECOG1X

Power Supplies and Decoupling
11 February 2010
It is recommended that VDD, IVDD and GND are implemented as power and ground planes in the
printed circuit board. The analogue power supply connections to the AVDD and AGND pins should be
routed directly to separate power and ground connections, they should not share circuit tracks with any
of the digital power supply connections. An ideal board layout should provide split power and ground
plane areas to separate the digital 3.3V, 1.8V and analogue power supplies.
Decoupling capacitors must be fitted on both the digital and analogue power supplies. The digital
power supply connections should have at least one 100nF capacitor for every two power pins, located
close to these pins. Ideally there should be one 100nF decoupling capacitor for each power pin. The
analogue power supplies should be decoupled separately with two 100nF capacitors in parallel,
located as close as possible to the AVDD and AGND pins. All these decoupling capacitors should be
low ESR ceramic types.
Additional bulk decoupling is required somewhere on the hardware design. At least one 10uF low ESR
tantalum or aluminium electrolytic capacitor is required on each power supply, usually located at the
power supply input connections or at the output of any power supply regulator. For larger designs it is
recommended that multiple capacitors are fitted; these should be distributed around the circuit board.
For further filtering on the analogue power supply AVDD, connect a ferrite bead in series with the
analogue supply input, between the 1.8V digital power supply and the analogue supply decoupling
capacitors. A suitable surface mount ferrite bead is the EPCOS B82496C3100J (inductance 10nH,
500mA, 0.3Ω DC resistance, 0603 package) available from Farnell Electronic Components (order
number 387-7024). Similarly, the USBVDD power supply pin should be decoupled separately with a
100nF capacitor and should have a series ferrite bead for filtering.
If the cost of a multilayer circuit board is too high for the target system and the layout is implemented
without power and ground planes, then care must be taken to minimise the series impedance in the
power and ground connections. Keep the power and ground tracks as short and as wide as possible,
and locate the decoupling capacitors as close as possible to the package power pins. Route separate
power and ground tracks from the power supply input connection to the ferrite beads and then to the
decoupling capacitors for the analogue power and ground pins AVDD and AGND, and make sure that
the decoupling capacitors are located as close as possible to these pins.
eCOG and CyanIDE are registered trademarks of Cyan Holdings plc
eCOG1X Microcontroller Product Family
www.cyantechnology.com
Version 1.17
53