K51P81M72SF1 Datasheet, PDF (55/77 Pages) Freescale Semiconductor, Inc – K51 Sub-Family

Peripheral operating requirements and behaviors
Table 35. VREF full-range operating requirements
Symbol
V_DDA
T_A
C_L
Description
Supply voltage
Temperature
Output load capacitance
Min.
1.71
Max.
3.6
−40
105
100
Unit
Notes
V
°C
nF
1, 2
1. C_L must be connected to VREF_OUT if the VREF_OUT functionality is being used for either an internal or external
reference.
2. The load capacitance should not exceed +/-25% of the nominal specified C_L value over the operating temperature range of
the device.
Table 36. VREF full-range operating behaviors
Symbol
V_out
V_out
V_out
V_step
V_tdrift
I_bg
I_lp
I_hp
ΔV_LOAD
Description
Voltage reference output with factory trim at
nominal V_DDA and temperature=25C
Voltage reference output — factory trim
Voltage reference output — user trim
Voltage reference trim step
Temperature drift (Vmax -Vmin across the full
temperature range)
Bandgap only current
Low-power buffer current
High-power buffer current
Load regulation
• current = ± 1.0 mA
Min.
1.1915
1.1584
1.193
—
—
—
—
—
Typ.
1.195
—
—
0.5
—
—
—
—
Max.
1.1977
1.2376
1.197
—
80
80
360
1
—
200
—
Unit
V
V
V
mV
mV
µA
uA
mA
µV
Notes
1
1
1
1, 2
T_stup Buffer startup time
—
—
20
µs
V_vdrift Voltage drift (Vmax - Vmin across the full voltage
—
2
—
mV
1
range)
1. See the chip's Reference Manual for the appropriate settings of the VREF Status and Control register.
2. Load regulation voltage is the difference between the VREF_OUT voltage with no load vs. voltage with defined load
Table 37. VREF limited-range operating requirements
Symbol
T_A
Description
Temperature
Min.
0
Max.
50
Unit
Notes
°C
Table 38. VREF limited-range operating behaviors
Symbol
V_out
Description
Voltage reference output with factory trim
Min.
Max.
Unit
1.173
1.225
V
Notes
K51 Sub-Family Data Sheet, Rev. 2, 4/2012.
Freescale Semiconductor, Inc.
55