Datasheet

Table 28. USB VREG electrical specifications
(continued)
Symbol Description Min. Typ.
1
Max. Unit Notes
• VREGIN = 5.0 V and temperature=25 °C
• Across operating voltage and
temperature
— — 4 μA
I
LOADrun
Maximum load current — Run mode — — 120 mA
I
LOADstby
Maximum load current — Standby mode — — 1 mA
V
Reg33out
Regulator output voltage — Input supply
(VREGIN) > 3.6 V
• Run mode
• Standby mode
3
2.1
3.3
2.8
3.6
3.6
V
V
V
Reg33out
Regulator output voltage — Input supply
(VREGIN) < 3.6 V, pass-through mode
2.1 — 3.6 V 2
C
OUT
External output capacitor 1.76 2.2 8.16 μF
ESR External output capacitor equivalent series
resistance
1 — 100 mΩ
I
LIM
Short circuit current — 290 — mA
1. Typical values assume VREGIN = 5.0 V, Temp = 25 °C unless otherwise stated.
2. Operating in pass-through mode: regulator output voltage equal to the input voltage minus a drop proportional to I
Load
.
3.8.3 SPI switching specifications
The Serial Peripheral Interface (SPI) provides a synchronous serial bus with master and
slave operations. Many of the transfer attributes are programmable. The following
tables provide timing characteristics for classic SPI timing modes. See the SPI chapter
of the chip's Reference Manual for information about the modified transfer formats used
for communicating with slower peripheral devices.
All timing is shown with respect to 20% V
DD
and 80% V
DD
thresholds, unless noted, as
well as input signal transitions of 3 ns and a 30 pF maximum load on all SPI pins.
Table 29. SPI master mode timing on slew rate disabled pads
Num. Symbol Description Min. Max. Unit Note
1 f
op
Frequency of operation f
periph
/2048 f
periph
/2 Hz 1
2 t
SPSCK
SPSCK period 2 x t
periph
2048 x
t
periph
ns 2
3 t
Lead
Enable lead time 1/2 — t
SPSCK
—
4 t
Lag
Enable lag time 1/2 — t
SPSCK
—
Table continues on the next page...
Peripheral operating requirements and behaviors
32 Kinetis KL24 Sub-Family, Rev4 03/2014.
Freescale Semiconductor, Inc.