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PCA9420 Datasheet(PDF) 21 Page - NXP Semiconductors

Part # PCA9420
Description  Power management IC for low-power microcontroller applications
PDF  87 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9420 Datasheet(HTML) 21 Page - NXP Semiconductors

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NXP Semiconductors
PCA9420
Power management IC for low-power microcontroller applications
aaa-033083
Device in non-charging mode
- VIN < VINUVLO
- CHG_EN=0 or 1
- TJ < TJ(OFF), 150°C
Any Charging State
VBAT > VBAT_DEAD
&&
tDGL_BAT_DEAD2LOW, 50µs
Charging Stopped
Any
charging
state
A programmed watchdog timer expired in
nEN_CHG_IN_WATCHDOG=1
&& WD_TIMER_A/B/C/D=2b01, 10, or 11
or
TJ ≥ a programmed TSHDN
or
One of the safety timers
(TCHG_PREQ & TCHG_FAST) expired
VIN has been validated
&&
Battery attached
&&
CHG_EN=1
Device in Dead Battery Charging
- Charge current=ICHG_DEAD
- TCHG_PREQ started counting
Device in Pre-Charge
(Low Voltage) Mode
- Charge current=ICHG_LOW
Device in Fast Charge Mode
- Charge current=ICHG_CC
- TCHG_PREQ reset
- TCHG_FAST started counting
VBAT > VBAT_LOW
&&
tDGL_BAT_LOW2CC, 50µs
Device in Top-Off Mode
- TCHG_FAST reset
- TCHG_TOPOFF started counting
ICHG < ICHG_TOPOFF for
tDGL_BAT_CC2TOPOFF, 20ms
TCHG_TOPOFF expired
Device in DONE Mode
- TCHG_TOPOFF reset
- ICHG=0mA
ICHG > 2x ICHG_TOPOFF or
20mA, whichever is lower
VBAT-VBAT_REG ≤ VBAT_RESTART,
140mV typ (240mV by MTP)
&&
tDGL_BAT_RESTART, 50ms
TJ = A programmed TTHEM_REGULATION
Charging in Thermal Regulation
- ICHG= (A programmed ICHG_CC) x
1_
2
VBAT ≤ VBAT_DEAD
VIN < VBAT +
VINBAT_HEADROOM
VBAT ≤> VBAT_LOW
&&
tDGL_BAT_CC2LOW, 50ms
Any Charging State
Sources 5mA
into battery for
300ms
The battery is
absent (open).
The charger stays
disabled
VBAT<3.4V
Battery detection
circuits sinks 5mA
from the battery
(VBAT) for 300ms
CHG_EN=1
&&
VIN OK
VBAT > 1.9V
Yes
Battery is attached.
Stop detection sequence.
Assert `present' Output
(Starts with the charger state
diagram: ”Device in Dead
Battery Charging”)
`Battery attached'
sequence
Figure 10. Charger state diagram
PCA9420
All information provided in this document is subject to legal disclaimers.
© 2022 NXP B.V. All rights reserved.
Product data sheet
Rev. 4.0 — 28 November 2022
21 / 87



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