
If the chop oscillator is being used, the internal bandgap reference voltage settles within
the chop oscillator start up time, Tchop_osc_stup.
The output buffer is disabled in this mode, and there is no buffered voltage output. The
Voltage Reference is in standby mode. If this mode is first selected and the low power or
high power buffer mode is subsequently enabled, there will be a delay before the buffer
output is settled at the final value. This is the buffer start up delay (Tstup) and the value is
specified in the appropriate device data sheet.
53.3.2.2 SC[MODE_LV] = 01
The internal VREF bandgap is on. The high power buffer is enabled to generate a
buffered 1.2 V voltage to VREF_OUT. It can also be used as a reference to internal
analog peripherals such as an ADC channel or analog comparator input.
If this mode is entered from the standby mode (SC[MODE_LV] = 00, SC[VREFEN] = 1)
there will be a delay before the buffer output is settled at the final value. This is the buffer
start up delay (Tstup) and the value is specified in the appropriate device data sheet. If
this mode is entered when the VREF module is enabled then you must wait the longer of
Tstup or until SC[VREFST] = 1 when the chop oscillator is not enabled. If the chop
oscillator is being used, you must wait the time specified by Tchop_osc_stup (chop
oscillator start up time) to ensure the VREF output has stabilized.
In this mode, a 100 nF capacitor is required to connect between the VREF_OUT pin and
VSSA.
53.3.2.3 SC[MODE_LV] = 10
The internal VREF bandgap is on. The low power buffer is enabled to generate a buffered
1.2 V voltage to VREF_OUT. It can also be used as a reference to internal analog
peripherals such as an ADC channel or analog comparator input.
If this mode is entered from the standby mode (SC[MODE_LV] = 00, SC[VREFEN] = 1)
there will be a delay before the buffer output is settled at the final value. This is the buffer
start up delay (Tstup) and the value is specified in the appropriate device data sheet. If
this mode is entered when the VREF module is enabled then you must wait the longer of
Tstup or until SC[VREFST] = 1 when the chop oscillator is not enabled. If the chop
oscillator is being used, you must wait the time specified by Tchop_osc_stup (chop
oscillator start up time) to ensure the VREF output has stabilized.
In this mode, a 100 nF capacitor is required to connect between the VREF_OUT pin and
VSSA.
Chapter 53 Voltage Reference (VREF)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
1353
Содержание K32 L2A Series
Страница 2: ...K32 L2A Reference Manual Rev 2 01 2020 2 NXP Semiconductors...
Страница 42: ...K32 L2A Reference Manual Rev 2 01 2020 42 NXP Semiconductors...
Страница 122: ...Flash Memory Clock K32 L2A Reference Manual Rev 2 01 2020 122 NXP Semiconductors...
Страница 146: ...Module operation in low power modes K32 L2A Reference Manual Rev 2 01 2020 146 NXP Semiconductors...
Страница 158: ...Debug and security K32 L2A Reference Manual Rev 2 01 2020 158 NXP Semiconductors...
Страница 174: ...Module Signal Description Tables K32 L2A Reference Manual Rev 2 01 2020 174 NXP Semiconductors...
Страница 246: ...Application information K32 L2A Reference Manual Rev 2 01 2020 246 NXP Semiconductors...
Страница 322: ...Kinetis Bootloader Status Error Codes K32 L2A Reference Manual Rev 2 01 2020 322 NXP Semiconductors...
Страница 344: ...Application initialization information K32 L2A Reference Manual Rev 2 01 2020 344 NXP Semiconductors...
Страница 374: ...CMP Trigger Mode K32 L2A Reference Manual Rev 2 01 2020 374 NXP Semiconductors...
Страница 384: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 384 NXP Semiconductors...
Страница 592: ...Application Information K32 L2A Reference Manual Rev 2 01 2020 592 NXP Semiconductors...
Страница 602: ...Initialization and application information K32 L2A Reference Manual Rev 2 01 2020 602 NXP Semiconductors...
Страница 656: ...Functional Description K32 L2A Reference Manual Rev 2 01 2020 656 NXP Semiconductors...
Страница 664: ...Functional Description K32 L2A Reference Manual Rev 2 01 2020 664 NXP Semiconductors...
Страница 744: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 744 NXP Semiconductors...
Страница 762: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 762 NXP Semiconductors...
Страница 806: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 806 NXP Semiconductors...
Страница 868: ...Integer square root K32 L2A Reference Manual Rev 2 01 2020 868 NXP Semiconductors...
Страница 976: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 976 NXP Semiconductors...
Страница 1012: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1012 NXP Semiconductors...
Страница 1094: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1094 NXP Semiconductors...
Страница 1132: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1132 NXP Semiconductors...
Страница 1182: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1182 NXP Semiconductors...
Страница 1290: ...Functional description K32 L2A Reference Manual Rev 2 01 2020 1290 NXP Semiconductors...
Страница 1344: ...USB Voltage Regulator Module Signal Descriptions K32 L2A Reference Manual Rev 2 01 2020 1344 NXP Semiconductors...
Страница 1356: ...Initialization Application Information K32 L2A Reference Manual Rev 2 01 2020 1356 NXP Semiconductors...