EVK-ACT8945AQJ303-T Datasheet, PDF (6/42 Pages) Active-Semi, Inc – Advanced PMU for Atmel SAMA5D3 Series & SAM9 Series Processors

ACT8945A
Rev 2, 11-Feb-14
PIN DESCRIPTIONS CONT’D
PIN
NAME
DESCRIPTION
23
ISET
Charge Current Set. Program the charge current by connecting a resistor (R_ISET) between ISET
and GA. See the Charge Current Programming section for more information.
24
25
26
27
28
29, 30
31, 32
33
TH
Temperature Sensing Input. Connect to battery thermistor. TH is pulled up with a 102µA (typ) current
internally. See the Battery Temperature Monitoring section for more information.
VSEL
SCL
SDA
nSTAT
BAT
VSYS
Step-Down DC/DCs Output Voltage Selection. Drive to logic low to select default output voltage.
Drive to logic high to select secondary output voltage. See the Output Voltage Programming
section for more information.
Clock Input for I²C Serial Interface.
Data Input for I²C Serial Interface. Data is read on the rising edge of SCL.
Active-Low Open-Drain Charger Status Output. nSTAT has a 8mA (typ) current limit, allowing it
to directly drive an indicator LED without additional external components. See the Charge Status
Indicator section for more information.
Battery Charger Output. Connect this pin directly to the battery anode (+ terminal)
System Output Pin. Bypass to GA with a 10µF or larger ceramic capacitor.
CHGIN
Power Input for the Battery Charger. Bypass CHGIN to GA with a capacitor placed as close to
the IC as possible.
34
OUT2 Output Feedback Sense for REG2.
35
VP2
Power Input for REG2. Bypass to GP12 with a high quality ceramic capacitor placed as close to
the IC as possible.
36
SW2 Switching Node Output for REG2.
37
GP12
Power Ground for REG1 and REG2. Connect GA, GP12 and GP3 together at a single point as
close to the IC as possible.
38
SW1 Switching Node Output for REG1.
39
VP1
Power Input for REG1. Bypass to GP12 with a high quality ceramic capacitor placed as close to
the IC as possible.
40
NC2 No Connect. Not internally connected.
EP
EP Exposed Pad. Must be soldered to ground on PCB.
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