Shared Bus Control for DC/DC Converter Auto-Calibration
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Solution Overview
Problem
Existing DC/DC converters face challenges in efficient calibration and voltage control due to the need for numerous interconnections and wires, leading to routing congestion and excess silicon area, which complicates auto-calibration and debugging processes.
Innovation Solution
A system utilizing a shared VOUT bus and clock signal within the DC/DC converter system for auto-calibration, Dynamic Voltage Scaling, Step by Step Voltage Scaling, Read Calibration Word, and Force Calibration Word modes, allowing for efficient calibration and control of DC/DC converters without adding excessive wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional DC/DC converter calibration methods are used with numerous interconnections and wires, then each converter can be controlled independently, but routing congestion and excess silicon area increase
Solution Approach 1:
Multiple DC/DC converters share a common communication bus (I2C or SMBus) for control and calibration operations. The bus controller consolidates multiple control interfaces into a single shared communication channel, reducing the number of interconnections and wires needed while maintaining the ability to address and control individual converters through digital addressing protocols
Solution Approach 2:
The shared communication bus serves multiple functions simultaneously: it provides control signals for voltage regulation, transmits calibration data, enables debugging operations, and allows reading of status information. This multi-functional approach eliminates the need for separate dedicated wires for each function, reducing overall routing complexity and silicon area
2Measurement precision
If auto-calibration is implemented with traditional wiring, then voltage accuracy can be maintained, but the calibration process becomes complex and difficult to debug
Solution Approach 1:
The system implements a feedback mechanism where the DAC output is monitored and fed back to the bus controller during calibration. The controller reads back the calibration values and voltage measurements through the shared communication bus, enabling automatic adjustment of DAC codes to achieve precise voltage output without complex external calibration equipment
Solution Approach 2:
The DC/DC converter system performs self-calibration by using its own internal resources (DAC, amplifier, communication interface) to automatically adjust and verify voltage accuracy. The bus controller orchestrates the calibration sequence, reads status registers, and makes adjustments without requiring external calibration equipment or complex manual procedures, simplifying the overall calibration process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient auto-calibration and voltage control of DC/DC converters, reducing routing congestion and silicon area, while facilitating debugging and precise voltage measurement.
Implementation Method 1
a digital to analog converter (DAC) configured to generate an analog voltage for one or more of the circuit elements based on a digital signal on the communication bus
Implementation Method 2
an amplifier, configured to adjust an offset according to an offset compensation code received from the digital module
Data Source
AI summary
A converter system is disclosed. The converter system including a system controller; a plurality of circuit elements configured to operate in response to control signals from the system controller; a bus controller configured to transmit data to a communication bus; and a plurality of power converters, each including a digital to analog converter (DAC) configured to generate an analog voltage for one or more of the circuit elements based on a digital signal on the communication bus; a digital module configured to receive digital data from the bus controller on the communication bus; and an amplifier, configured to adjust an offset according to an offset compensation code received from the digital module.