Data Sheet

CLK selected by SPI_PIO#.
17
SPI_CSB
Programmable I/O line or debug SPI
chip select (CSB) selected by
SPI_PIO#.
chip select for SPI, active low
20
RESET
The RESET pin is an active high reset
and is internally filter educing the
internal low frequency clock
oscillator .A reset will be performed
between1.5 and 4.0ms following
RESET being active.
Reset if low. Pull low for
minimum 5ms to cause a
reset.
22
LED_1
Bidirectional
Programmable Input/Output
Line & LED driver
23
LED_0
Bidirectional
Programmable Input/Output
Line & LED driver
24
POWER_VRE
G
Enable pin for the internal 1.8V
regulator, This pin is only available
with production version
Regulator enable input.
Can also be sensed as an
input.
Regulator enable and
multifunction button. A high
input (tolerant to VBAT)
enables the on-chip
regulators, which can then be
latched on internally and the
button used as a
multifunction input.
26
VBUS
Power supply and control
Charger input.
Typically connected to VBUS
(USB supply)
27
CHG_EXT
Power supply and control
External battery charger
control.
External battery charger
transistor base control when
using external charger boost.
Otherwise leave
unconnected.
28
VBAT_SENSE
Power supply and control
Battery charger sense input.
Connect directly to the
battery positive pin.
29
VBAT
Input for an internal 1.8V
switched mode regulator
combined with output of the
internal battery charger.
Battery charger input
Tonly confidential