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Pin | Net | |
|---|---|---|
Net | Pin | |
|---|---|---|
IC1:VBAT |
Designators | Net | |
|---|---|---|
Inspect
BQ2550 Sub-l
Controls
Properties
Availability & Pricing
| Distributor | Qty 1 | |
|---|---|---|
| Digi-Key | $2.36–$4.79 | |
| LCSC | $3.07 | |
| Mouser | $3.30 | |
Assets
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- Pins and Functions:
- VSS (1, 13): Ground pins
- VIN_DC (2): Input voltage from a DC power source
- VOC_SAMP (3): Sampled open-circuit voltage from an energy-harvesting source
- VREF_SAMP (4): Reference voltage for internal operations
- OT_PROG (5): Over-temperature programming
- VBAT_OV (6): Battery over-voltage threshold setting
- VRDIV (7): Resistor divider used for VOC_SAMP
- VBAT_UV (8): Battery under-voltage threshold setting
- OK_HYST (9): Sets hysteresis on OK_PROG output
- OK_PROG (10): Programmable threshold indicator
- VBAT_OK (11): Indicates if the battery voltage is within acceptable range
- AVSS (12): Analog ground
- VBAT (14): Battery connection
- VSTOR (15): Energy storage output
- LBST (16): Boost inductor connection
- PAD (17): Thermal pad should be connected to ground
Resistors- Various resistors (R1, R2, R3, etc.) with specified resistance values are used for setting different voltage thresholds and providing feedback.
- Examples:
- R5: 5.90MΩ, forming part of the resistor divider network.
- R4: 4.42MΩ, likely involved in voltage sensing.
Capacitors- Capacitors (C1, C2, C3, C4) serve to filter and stabilize voltages, smoothing out the power supply to avoid noise and fluctuations.
- Examples:
- C1 and C3: 4.7µF, probably used for decoupling and energy storage.
- C4: 0.01µF, possibly used for finer filtering tasks.
Inductor- L1: 22µH, used as a part of the boost converter circuit to step up the voltage as required for the storage element or load.
Nets- VBAT_OV, VBAT_UV, VBAT_OK, VIN_DC, OK_PROG, OK_HYST: These nets represent various nodes in the circuit, connecting resistors, capacitors, and other elements to the relevant pins on the IC.
Assumptions and Additional Remarks- The circuit seems to be designed for energy harvesting using a solar panel, as inferred from the designator SOLAR+ and VIN_DC connections.
- The resistors and capacitors associated with VBAT_OV, VBAT_UV, and VBAT_OK indicate settings for over and under voltage protection of the battery.
Next Steps