Part Datasheet Review and Validation

flux

Reviewed the AEM13921 part against the official e-peas datasheet and created the detailed report here: AEM13921 Part Datasheet Review.
Summary: the 40 QFN pins plus exposed GND pad are present and the symbol pin names/numbers match the datasheet. The main gaps are metadata quality: terminals have Pin Type: Unspecified, pin descriptions are not populated from the datasheet, and part-level MPN/manufacturer/package metadata was not visible in the schematic terminal data. No open review warnings/errors were returned for terminal or missing-footprint checks.
adrian95

adrian95

Populate the Pin Type and Pin Description fields from the datasheet. and place each pin into the correct section based on the datasheet.

flux

I’ll populate the terminal metadata directly from the datasheet: Pin Type, Pin Description, and Section for each physical pin, then verify the fields were applied.

flux

Populated all 41 AEM13921 terminals with datasheet-derived Pin Description, Pin Type, and Section, then verified the fields in the schematic.
I kept the section names aligned to the datasheet groupings: Power Pins, Configuration Pins, Control Pin, I2C Pins, Status Pin, and Other Pins. Pin types were normalized to valid electrical types such as Power In, Power Out, Ground, Input, Output, Bi-Directional, and Passive.
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AEM13921 Part Datasheet Review
Date: 2026-06-07
Scope
Reviewed available part/project information for the AEM13921-QFN part project: MPN/package/pin count/description/properties, datasheet availability, schematic symbol terminals, PCB footprint pads, and pin descriptions versus the official e-peas datasheet.
Datasheet
Available Part Information Observed in Project
  • Project name: AEM13921-QFN
  • Project description: Ultra Efficient Dual Sources Energy Manager with Ratio/Constant Voltage Regulation, Regulated Buck Output and 5 V Charger, 120 mV, 135 mA
  • Schematic/BOM state: part-project style symbol made of 41 terminal components; BOM reports no separately added parts.
  • Layout state: 41 pad nodes plus QFN footprint containers/shapes.
  • Package observed from datasheet: QFN 40-pin, 5 x 5 mm body, exposed GND pad.
  • MPN/ordering part number from datasheet: 10AEM13921J0000.
Key Datasheet Specs
  • Device: AEM13921 ultra-efficient dual-source energy harvesting PMIC.
  • Harvest inputs: dual independent boost inputs, simultaneous harvesting.
  • Cold-start: 275 mV / 1.5 uW; harvests from 120 mV after cold start.
  • Source regulation: MPPT ratio mode or constant-voltage mode.
  • Efficiency: boost conversion above 90%; buck efficiency up to 96%.
  • Buck output: selectable 0.6 V to 3.3 V; output current up to 100 mA.
  • 5 V charger: 5V_IN charging input, configurable CC/CV, 13.5 mA to 135 mA constant-current range using R5V_IMAX.
  • VDDIO operating voltage: 1.5 V to 5.0 V.
  • Absolute max: most external pins -0.3 V to 5.50 V; VINT/config/thermal pins -0.3 V to 2.75 V.
  • Temperature: operating junction -40 C to 85 C; storage -65 C to 150 C.
  • Thermal: QFN-40 thetaJA 50 C/W, thetaJC 5 C/W.
  • MSL: Level 1. RoHS and REACH compliant per datasheet.
  • LBOOSTx: typ 33 uH; minimum peak current 135 mA with recommended operating conditions.
  • CSRCx: typ 10 uF effective on BUFSRCx when boost x is used.
  • LBUCK: typ 10 uH; minimum peak current 135 mA with recommended operating conditions.
  • CLOAD: typ 22 uF when buck is used.
  • CINT: mandatory, typ 10 uF on VINT.
  • CSTO: mandatory, typ 47 uF on STO.
  • C5V: typ 47 uF when 5 V charger is used.
  • R5V_IMAX: 0.37 kOhm to 3.7 kOhm when 5 V charger current limit is used.
  • I2C pull-ups: typ 1 kOhm to VDDIO when I2C is used.
  • Thermal monitoring: NTC thermistor and divider optional; TH_MON to VINT if unused.
Symbol Pin Cross-Check
All 41 schematic terminal names and pin numbers match the datasheet pin list, including the exposed GND pad:

Table

PinDatasheet nameProject terminalResult
1ZMPPZMPPMatch
2SRC1SRC1Match
3BUFSRC1BUFSRC1Match
4SWBOOST1SWBOOST1Match
5SWBOOST2SWBOOST2Match
6BUFSRC2BUFSRC2Match
7SRC2SRC2Match
8SHIP_MODESHIP_MODEMatch
9ST_LOADST_LOADMatch
10LOAD_CFG[1]LOAD_CFG[1]Match
11LOAD_CFG[2]LOAD_CFG[2]Match
12SWBUCKSWBUCKMatch
13STOSTOMatch
14LOADLOADMatch
155V_IN5V_INMatch
165V_IMAX5V_IMAXMatch
17VDDIOVDDIOMatch
18IRQIRQMatch
19SCLSCLMatch
20SDASDAMatch
21ST_STOST_STOMatch
22STO_CFG[0]STO_CFG[0]Match
23STO_CFG[1]STO_CFG[1]Match
24STO_CFG[2]STO_CFG[2]Match
25SRC1_MODESRC1_MODEMatch
26SRC1_CFG[0]SRC1_CFG[0]Match
27SRC1_CFG[1]SRC1_CFG[1]Match
28VINTVINTMatch
29SRC1_CFG[2]SRC1_CFG[2]Match
30SRC1_CFG[3]SRC1_CFG[3]Match
31SRC1_CFG[4]SRC1_CFG[4]Match
32SRC2_MODESRC2_MODEMatch
33SRC2_CFG[0]SRC2_CFG[0]Match
34SRC2_CFG[1]SRC2_CFG[1]Match
35SRC2_CFG[2]SRC2_CFG[2]Match
36LOAD_CFG[0]LOAD_CFG[0]Match
37SRC2_CFG[3]SRC2_CFG[3]Match
38TH_MONTH_MONMatch
39SRC2_CFG[4]SRC2_CFG[4]Match
40TH_REFTH_REFMatch
EPGNDGND, Pin Number 41Functionally match; datasheet labels this as Exposed Pad rather than numeric pin 41.
Footprint Cross-Check
  • Datasheet package: QFN 40-pin, 5 x 5 mm body, exposed GND pad.
  • Project layout: 41 pad nodes matching 40 perimeter pins plus exposed GND pad.
  • Footprint container and fab/silk shapes are present.
  • No open review warnings were returned for missing footprints.
  • Limitation: this review could confirm pad count and terminal mapping from available layout data, but not every pad dimension/coordinate against the mechanical drawing because the inspected layout tree did not expose detailed pad geometry in the result.
Mismatches / Issues Flagged
  1. Missing rich pin descriptions: project terminals currently have Pin Type: Unspecified and do not include datasheet Pin Description text. This is a metadata quality gap even though pin names and numbers match.
  2. Exposed pad numbering convention: the project represents GND exposed pad as Pin Number: 41; the datasheet calls it Exposed Pad. This is acceptable if the footprint uses pad 41 for EP, but should be documented as an intentional convention.
  3. Package/MPN properties were not visible in schematic terminal metadata. Recommended part-level metadata to record: Manufacturer Name = e-peas, Manufacturer Part Number = 10AEM13921J0000, Package or Case Code = QFN-40 5x5mm, Datasheet URL = official e-peas PDF.
Review Results
  • Component/terminal review checks queried: no ERROR/WARNING/UNCERTAIN/OPEN checks returned.
  • Missing-footprint review: no ERROR/WARNING/UNCERTAIN/OPEN checks returned.
Recommendation
Update the part terminal metadata with datasheet-derived Pin Type and Pin Description values, and ensure part-level metadata includes official MPN, manufacturer, package, and datasheet URL. The symbol pin names/numbers and pad count are otherwise consistent with the official datasheet.

    Scope

    Datasheet

    Available Part Information Observed in Project

    Key Datasheet Specs

    Recommended External Components From Datasheet

    Symbol Pin Cross-Check

    Footprint Cross-Check

    Mismatches / Issues Flagged

    Review Results

    Recommendation

Documents

    AEM13921 Part Datasheet Review

Assets

AEM13921-QFN

AEM13921-QFN

AEM13921-QFN Symbol.svgDefault
stp

AEM13921-QFN

AEM13921-QFN.stp3D Model
kicad_mod

AEM13921-QFN

QFN40P500X500X80-41N-D.kicad_modFootprint
AEM13921-QFN-thumb.png

AEM13921-QFN-thumb.png

AEM13921-QFN-thumbThumbnail

AEM13921-QFN

AEM13921-QFN thumbnail
Ultra Efficient Dual Sources Energy Manager with Ratio/Constant Voltage Regulation, Regulated Buck Output and 5 V Charger, 120 mV, 135 mA
The AEM13921 is a fully integrated and compact power management circuit that extracts DC power from two harvesting sources to store energy in a rechargeable storage element and supply an application circuit. A 5 V input can also be used to charge the storage element (e.g., if it gets depleted). This compact and ultra-efficient PMIC allows for extending battery lifetime and eliminating the primary energy storage in a large range of applications. Both sources implement Maximum Power Point Tracking (MPPT) based on open-circuit voltage ratio as well as constant source voltage regulation features, allowing for harvesting the maximum power available from each source to charge the storage element. With its unique cold-start circuit, it can start operating with an input voltage as low as 275 mV (min. 1.5 µW power). The configurable protection thresholds prevent overcharging and overdischarging the storage element. No external components are required to set those thresholds. The thermal monitoring prevents charging and discharging the storage element outside a configurable temperature range. The Average Power Monitoring (APM) allows the application circuit to get an estimate of the energy harvested from each source to the battery and from the battery to the application circuit. A shipping mode is available to avoid charging and discharging the storage element during shipping or storage. A buck regulator with selectable output voltage allows an application circuit to be supplied with high efficiency. I²C communication allows users to control every setting of the AEM13921 from the application circuit MCU.
Features and Benefits Dual sources inputs
  • Boost operation optimized for each source.
  • Conversion efficiency above 90 % on each source.
  • Harvests from 120 mV after cold start.
  • Simultaneous harvesting from both sources.
  • Up to 135 mA current extracted from the harvester. Maximum Power Point Tracking
  • Both sources configurable to constant voltage mode or to open-circuit voltage ratio mode.
  • Optimal harvesting from a multiple combinations of harvesters (PV cells, RF, vibration, pulsed sources...). Cold start from 275 mV / 1.5 µW input
  • Startup at ultra-low power from each harvesting source input. Configurable overdischarge & overcharge protection
  • Supports various types of rechargeable storage elements (LiC, Li-ion, LiPo, Li-ceramic pouch...). Regulated output for application circuit
  • Buck regulator conversion efficiency up to 96 %.
  • Selectable output voltage between 0.6 V and 3.3 V.
  • Output current up to 100 mA. Thermal monitoring
  • Storage element protection against overtemperature and under-temperature during charging and discharging, independently. Average Power Monitoring
  • Provides data to determine how much energy has been transferred to the storage from each source and from the 5 V charger, as well as the energy drained from the storage to supply the application circuit. System configuration by GPIO or I²C communication
  • All settings dynamically configurable through GPIO or I²C (Fast Mode Plus).
  • System data available through I²C. Shipping mode
  • Storage element charge and discharge disabling during shipment. External 5 V charging capability
  • Extra charging input for 5 V power supplies.
  • Configurable CC and CV modes (max. 135 mA).
  • Provides a fast charging alternative when no source is available for a long time.
#AEM13921 #EnergyHarvesting #PowerManagementIC #PMIC #MPPT #BatteryCharging #EnergyAutonomous #IoT #WirelessSensor #IndustrialMonitoring #EmbeddedSystems #QFN #epeas #LowPowerDesign

Properties

AEM13921-QFN

E-PEAS

Linear Regulator

e-peas.com/documents/AEM13921/DS-AEM13921.pdf

IC

QFN

creativecommons.org/licenses/by/4.0/

parametric-v1

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