mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 718

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

Introduction
32.1.1 Overview
The Voltage Reference optimizes the existing bandgap and bandgap buffer system. Unity
gain amplifiers ease the design and keep power consumption low. The TRM register's
TRIM[5:0] bitfield is user accessible so the Voltage Reference can be trimmed in an
application.
The Voltage Reference contains trim resolution of 0.5 mV per step. The buffer has high
power mode with high output current. In addition, the buffer is available for use with
ADCs and DACs in low power mode. The voltage can be output on a dedicated output
pin.
32.1.2 Features
The Voltage Reference has the following features:
718
1. In the Tight-Regulation buffer mode (when SC[MODE_LV]=10), a 100 nF capacitor is required to be connected between
• Programmable trim register with 0.5 mV steps, automatically loaded with factory
• Programmable buffer mode selection:
• 1.2 V output at room temperature
• Dedicated output pin, VREF_OUT
• Load regulation in tight-regulation mode of 100 µV/mA max
• Power supply rejection (PSR) of 0±0.1 mV DC and -60 dB AC
• High power output mode
the VREF_OUT pad and the ground.
1
trimmed value upon reset
• Off
• Bandgap out
• Low-power buffer mode
• Tight-regulation buffer mode
MCF51JF128 Reference Manual, Rev. 2, 03/2011
Preliminary
Freescale Semiconductor, Inc.