L6460 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6460' PDF : 139 Pages View PDF
L6460
18 Low voltage power switches
Low voltage power switches
Low voltage power switches are analog switches designed to operate from a single +2.4 V
to +3.6 V VGPIO_SPI supply. They are intended to provide and remove power supply to low
voltage devices. When switched on, they connect the VGPIO_SPI pin to their output pin
(GPIO[6] for low voltage power switch 1 or GPIO[7] for low voltage power switch 2) thus
powering the device connected to it. The turning on and off of each switch can be controlled
through serial interface.
L6460 provides 2 low voltage power switches, each of them has current limitation to
minimum 150mA to limit inrush current when charging a capacitive load. When the limit
current has been reached, for more than a Tfilter time, then a flag is activated; this flag is
latched in the central logic and can be cleared by the firmware. Please note that, in case of
capacitive load, the current limit is reached the first time the low power switch is turned on:
therefore the user will find a limit flag that must be cleared.
The 2 low voltage power switches can be externally paralleled to obtain a single super low
voltage power switch. Low voltage pass switches sink current needed for their functionality
from pin VGPIO_SPI, they never inject current on this pin.
Figure 27. Low power switch block diagram
V GPIO_SPI
EnLowVSw[x]
To SPI
LowVSwIlim[x]
S
LowVSwIlimLth[x]
R
Current
Limit
Sensor
ClrLowVrSwLth
Reset State
GPIO[6]/GPIO[7]
Driver
GPIO[6] (LPS 1)
or
GPIO[7] (LPS 2)
Doc ID 17713 Rev 1
89/139
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