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VR5510 Datasheet(PDF) 71 Page - NXP Semiconductors

Part # VR5510
Description  Multi-output PMIC with SMPS and LDO
PDF  203 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

VR5510 Datasheet(HTML) 71 Page - NXP Semiconductors

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NXP Semiconductors
VR5510
Multi-output PMIC with SMPS and LDO
WDW_RECOVERY [3:0]
Watchdog Window Duration when
the device is in Fault Recovery Strategy
0100
4.0 ms
0101
6.0 ms
0110
8.0 ms
0111
12 ms
1000
16 ms
1001
24 ms
1010
32 ms
1011(default)
64 ms
1100
128 ms
1101
256 ms
1110
512 ms
1111
1024 ms
Reset condition
POR
Table 50. Fault recovery window configuration...continued
The transition from WD_WINDOW to WDW_RECOVERY happens when the FCCU pin indicates an error and
FS0B is asserted.
If the MCU sends a good watchdog refresh before the end of the WDW_RECOVERY duration, the device
switches back to the WD_WINDOW duration and the associated duty cycle if the FCCU pins no longer indicate
an error. Otherwise, a new WDW_RECOVERY period is started.
If the MCU does not send a good watchdog refresh before the end of the WDW_RECOVERY duration, a reset
pulse is generated and the Fail-safe state machine moves back to INIT_FS.
aaa-039394
Normal phase
FCCU
Normal phase
Error phase
Error phase
WDW_PERIOD
WD_WINDOW
FS0B
RSTB
WDW_PERIOD
good WD
FCCU error
FLT_ERR_CNT + 1
FCCU error
FLT_ERR_CNT + 1
good WD
bad WD or
window timeout
WDW_RECOVERY
WDW_RECOVERY
INIT_FS
WDW_RECOVERY
Figure 34. Fault recovery strategy
22.5 FCCU monitoring
The FCCU input pins monitor hardware failures from the MCU. The FCCU input pins can be configured by
pair, or as single independent inputs. FCCU monitoring is active as soon as the INIT_FS is closed by the first
good watchdog refresh. The FCCU input pins are configured by pair, or single independent inputs with the
FCCU_CFG[1:0] bit field (FS_I_SAFE_INPUTS register).
VR5510
All information provided in this document is subject to legal disclaimers.
© 2023 NXP B.V. All rights reserved.
Product data sheet
Rev. 6 — 31 July 2023
71 / 203



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