Power Supply Concept C515C 8-Bit Microcontroller This application

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Power Supply Concept C515C 8-Bit Microcontroller This application

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Microcontrollers ApNote AP0825
Power Supply Concept C515C 8-Bit Microcontroller
This application note introduces power supply concept C515C deals with enhanced feature this controller switch Address Latch Enable (ALE) output signal during accesses internal ROM. Kern Siemens Application Support
05.97,
Power Supply Concept C515C
Contents
Page
Introduction Dedicated Power Supply Pins C515C On-chip Power Supply Concept Power Supply Concept Switch Feature Conclusion
AP0825 ApNote Revision History Actual Revision 05.97 Page Page actual Rev. prev.Rel. Previous Revision none (Original Version) Subjects (changes since last release)
AP0825 05.97
Power Supply Concept C515C
Introduction
This application note describes power supply concept Siemens C515C 8-Bit microcontroller introduces corresponding suggestion corresponding schematic. Moreover this paper deals with enhanced feature C515C, which switch Address Latch Enable output signal (ALE) while accessing internal code memory (ROM). significant improvement behavior this controller achieved with this feature. Dedicated Power Supply Pins C515C
pins C515C 8-Bit microcontroller dedicated power supply pins, which more then pins MQFP package. These pins arranged grouped into power supply ground pins used connect controller external power supply. symbolic names numbers listed table table below. configuration C515C shown figure On-chip Power Supply Concept
C515C on-chip power supply rings. power ring supplies core peripherals (Oscillator circuit, ADC, Timer Units, SSC, USART, etc.). other used feed ports (pads). Each these power rings least connected supply pairs. These multiple supply nodes lead balanced supply voltage over chip stable levels. pairs VCC1/VSS1 VCCCLK/VSSCLK belong power ring internal logic. power ring pads connected three supply pairs VCCE1/VSSE1, VCCE2/VSSE2 VCCEXT/VSSEXT. power rings connected internally only pins VCC1/VCCE1 VSS1/VSSE1 over bond wires. this, interferences between power rings minimized. Additionally, C515C provides on-chip decoupling capacitors, building approx. These measures lead approach towards improved behavior this device. Table Supply pairs core peripherals Symbol VCC1 VCCCLK Number Symbol VSS1 VSSCLK Number Function supply pair core peripherals supply pair on-chip oscillator circuit, core peripherals
Table Supply pairs ports Symbol VCCE1 VCCE2 VCCEXT Number Symbol VSSE1 VSSE2 VSSEXT Number Function supply pair ports (pads) supply pair ports (pads) supply pair ports (pads)
AP0825 05.97
Power Supply Concept C515C
Power Supply Concept
general, separate planes recommended layout ceramic capacitors (X7R) should used decoupling capacitances order obtain best behavior. Figure introduces suggestion, whereby controller connected supply voltage with supply pairs. pairs VCC1/VSS1 VCCE1/VSSE1 have also connected externally PCB) handled supply input (see figure Each supply input should blocked with capacitor These block capacitors should placed near possible power supply pins controller order avoid parasitical inductances. layouts, which separate planes, recommended feed C515C straight from voltage source VCC1/VSS1 connect other power supply pins directly this point. This suggestion many applications should regarded only possible solution.
33nF
P5.6 P5.5 P5.4 P5.3 P5.2 P5.1 P5.0 VCCE2 HWPD VSSE2 N.C. P4.0 ADST P4.1 SCLK P4.2 P4.3 P4.4 P4.5 INT8 P4.6 TXDC P4.7 RXDC RESET N.C. VAREF VAGND P6.7 AIN7 P6.6 AIN6 P6.5 AIN5 P6.4 AIN4 P6.3 AIN3 P6.2 AIN2 P6.1 AIN1 P6.0 AIN0 VSSCLK VCCCLK P3.0 P3.1 P3.2 INT0 P3.3 INT1 P3.4 P3.5
33nF
C515C P-MQFP-80 Package
P5.7 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 VSSEXT VCCEXT PSEN CPUR P2.7 P2.6 P2.5 P2.4 P2.3
33nF
Figure Schematic power supply concept C515C
P2.2 P2.1 P2.0 XTAL1 XTAL2 VSSE1 VSS1 VCC1 VCCE1 P1.0 INT3 P1.1 INT4 P1.2 INT5 P1.3 INT6 P1.4 INT2 P1.5 T2EX P1.6 CLKOUT P1.7 P7.0 INT7 P3.7 P3.6
33nF
AP0825 05.97
Power Supply Concept C515C
Switch Feature
order improve behavior this device, when using internal ROM, C515C allows switch Address Latch Enable output signal (ALE). This enhanced capability only become active internal used (EA=1). With EA=1 there port activity Port Port while accessing internal code memory, output signal still generated. signal suppressed clearing EALE (Enable output) SYSCON (located address B1H) output will only become active during external data memory accesses. After hardware reset generation enabled. Reset value: EALE comparison measurements according 767.14 indicates contribution output signal global EME. usage switch feature reduce global dBµV within lower frequency range during internal code memory accesses. This significant impact switch feature C515C shown figure bright curve (C515C corresponds measurement done with activated output signal dark curve (C515C OFF) corresponds measurement done with deactivated output signal while accessing internal (EA=1).
Conducted Ground Bouncing Measurement
dBµV
30,00
50,00
70,00 C515C
90,00
110,00 Frequency
130,00
150,00
170,00
190,00
C515C
Figure Comparison behavior C515C with on/off Measurement conditions: measurements according 767.14 Device: C515C fosc: Supply Voltage: Temperature:
Note: This measurements relative measurements covering ground bouncing. investigations done absorbing hall with radio meter antennas deliver deviating results. Semiconductor Group AP0825 05.97
Power Supply Concept C515C
Conclusion
Optimized behavior application circuit typically important demand fulfilled automotive applications. This requirement becomes more more necessary other application segments, too. improved internal power supply concept C515C approach towards improved behavior this microcontroller. explanations design hints given this application note show this internal power supply concept order obtain optimized behavior. Additionally, above described switch feature Siemens C515C 8-Bit microcontroller contribute improved behavior application.
AP0825 05.97

Power Supply Concept C515C 8-Bit Microcontroller This application

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