Functional Description; Voltage Reference Disabled, Sc[Vrefen] = 0; Voltage Reference Enabled, Sc[Vrefen] = 1 - NXP Semiconductors MKL27Z128VFM4 Reference Manual

Functional Description

Field
0 The module is disabled or not stable.
1 The module is stable.
MODE_LV Buffer Mode selection
These bits select the buffer modes for the Voltage Reference module.
00 Bandgap on only, for stabilization and startup
01 High power buffer mode enabled
10 Low-power buffer mode enabled
11 Reserved
26.3 Functional Description
The Voltage Reference is a bandgap buffer system. Unity gain amplifiers are used.
The VREF_OUT signal can be used by both internal and external peripherals in low and
high power buffer mode. A 100 nF capacitor must always be connected between
VREF_OUT and VSSA if the VREF is being used.
The following table shows all possible function configurations of the Voltage Reference.
Table 26-2. Voltage Reference function configurations
SC[VREFEN]
0
1
1
1
1

26.3.1 Voltage Reference Disabled, SC[VREFEN] = 0

When SC[VREFEN] = 0, the Voltage Reference is disabled, the VREF bandgap and the
output buffers are disabled. The Voltage Reference is in off mode.
428
VREF_SC field descriptions (continued)
SC[MODE_LV]
X
00
01
10
11
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Description
Configuration
Voltage Reference disabled
Voltage Reference enabled,
bandgap on only
Voltage Reference enabled,
high-power buffer on
Voltage Reference enabled,
low power buffer on
Reserved
Functionality
Off
Startup and standby
VREF_OUT available for
internal and external use. 100
nF capacitor is required.
VREF_OUT available for
internal and external use. 100
nF capacitor is required.
Reserved
Freescale Semiconductor, Inc.