mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 717

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

Chapter 32
Voltage Reference (VREF)
32.1 Introduction
The VREFV1 Voltage Reference is intended to supply an accurate voltage output that is
trimmable with the TRM register's TRIM[5:0] bitfield in 0.5 mV steps. The VREFV1 can
be used in medical applications such as glucose meters to provide a reference voltage to
biosensors or as a reference to analog peripherals such as the ADC, DAC, or CMP. The
voltage reference has three operating modes that provide different levels of load
regulation and power consumption.
The following figure is a block diagram of the Voltage Reference.
Freescale Semiconductor, Inc.
SC[MODE_LV]
SC[VREFEN]
TRM
6 BITS
2 BITS
Figure 32-1. Voltage reference block diagram
MCF51JF128 Reference Manual, Rev. 2, 03/2011
BANDGAP
Preliminary
1.75 V Regulator
1.75 V
REGULATION
BUFFER
VDDA
SC[VREFST]
VREF_OUT
DEDICATED
OUTPUT PIN
100 nF
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