APPLICATION NOTE
R01AN0473EJ0100 Rev.1.00 Page 1 of 44
Mar. 28, 2011
32-bit Single-Chip Microcontrollers
V850ES/Jx3-L
Power Supply Current
Introduction
This application note describes the functions that relate to lowering the power supply current of the
V850ES/Jx3-L. Readers should use the information in this document to understand the features of this product’s
power supply current and the functions used to reduce it, and apply this knowledge to reduce the power supply
current of their application system.
Target Devices
V850ES/JC3-L
•
μ
PD70F3797
•
μ
PD70F3798
•
μ
PD70F3799
•
μ
PD70F3800
•
μ
PD70F3801
•
μ
PD70F3802
•
μ
PD70F3803
•
μ
PD70F3804
•
μ
PD70F3838
•
μ
PD70F3839
V850ES/JE3-L
•
μ
PD70F3805
•
μ
PD70F3806
•
μ
PD70F3807
•
μ
PD70F3808
•
μ
PD70F3840
V850ES/JF3-L
•
μ
PD70F3735
•
μ
PD70F3736
V850ES/JG3-L
•
μ
PD70F3737
•
μ
PD70F3738
•
μ
PD70F3792
•
μ
PD70F3793
•
μ
PD70F3841
•
μ
PD70F3842
Contents
CHAPTER 1 OVERVIEW .................................................................................3
1.1
Introduction .........................................................................................3
1.2
Power Supply Current Data ................................................................3
CHAPTER 2
FEATURES OF V850ES/Jx3-L POWER SUPPLY CURRENT ..4
2.1
Processing Performance and Power Consumption ............................4
2.2
Operating Frequency and Power Supply Current...............................5
2.3
Operating Ambient Temperature and Power Supply Current.............6
2.4
Power Supply Voltage and Power Supply Current .............................7
CHAPTER 3
FUNCTIONS USED TO REDUCE POWER SUPPLY
CURRENT...................................................................................8
3.1
Clock Control.......................................................................................8
3.1.1
CPU clock selection ..................................................................10
3.1.2
PLL function...............................................................................12
3.1.3
Internal oscillator .......................................................................15
3.1.4
Function to supply/stop clock to peripheral functions................16
3.2
Standby Function ..............................................................................18
3.2.1
Types of operating and standby modes ....................................18
3.3
A/D Converter ...................................................................................20
3.4
Watch Timer Function and Timer M..................................................21
APPENDIX A Power Supply Current Characteristics.....................................23
A.1
Operating Frequency vs. Power Supply Current Characteristics
(in Normal Operation Mode) .............................................................23
A.2
Operating Ambient Temperature vs. Power Supply Current
Characteristics ..................................................................................27
A.3
Power Supply Voltage vs. Power Supply Current Characteristics....34
R01AN0473EJ0100
Rev.1.00
Mar. 28, 2011
V850ES/Jx3-L Power Supply Current
32-bit Single-Chip Microcontrollers
Mar. 28, 2011
INTRODUCTION
Target readers This Application Note is intended for users who understand the functions of the V850ES/Jx3-L
and who will use this product to design application systems.
Purpose The purpose of this application note is to help users understand how to reduce the power supply
current of the V850ES/Jx3-L.
Organization This document consists of the following main sections.
• Overview
• Features of V850ES/Jx3-L power supply current
• Functions used to reduce power supply current
How to read It is assumed that the reader of this document has general knowledge in the fields of electrical
this document engineering, logic circuits, and microcontrollers.
To obtain an overview of the functions of the V850ES/Jx3-L:
→ Read this manual in the order of the Contents.
To understand the features of the power supply current in the V850ES/Jx3-L:
→ See CHAPTER 2 FEATURES OF V850ES/Jx3-L POWER SUPPLY CURRENT.
To understand the functions used to reduce the power supply current:
→ See CHAPTER 3 FUNCTIONS USED TO REDUCE POWER SUPPLY CURRENT.
To learn more about the V850ES/Jx3-L’s hardware functions:
→ See the hardware user’s manual of each V850ES/Jx3-L product.
Conventions Data significance: Higher digits on the left and lower digits on the right
Active low representation: xxx (overscore over pin or signal name)
Note: Footnote for item marked with Note in the text
Caution: Information requiring particular attention
Remark: Supplementary information
Numeral representation: Binary..................xxxx or xxxxB
Decimal...............xxxx
Hexadecimal .......xxxxH
Related The related documents indicated in this publication may include preliminary versions.
documents However, preliminary versions are not marked as such.
Documents related to V850ES/Jx3-L
Document Name Document Number
V850ES Architecture Hardware User's Manual U15943EJ
V850ES/JC3-L, V850ES/JE3-L Hardware User's Manual R01UH0018EJ
V850ES/JG3-L Hardware User's Manual R01UH0165EJ
V850ES/JF3-L Hardware User's Manual R01UH0017EJ
R01AN0473EJ0100 Rev.1.00 Page 2 of 44