Part Number: AM2434 On HSSE devices, the SYSFW supports the Keyring feature which extends the Root of Trust ( RoT ) to auxiliary keys. This enables the authentication of the application images using these auxiliary keys apart from the programmed SMPKH…

Part Number: BQ25173 Slow charging or reduced current from the BQ25173 is almost always caused by thermal regulation (TREG) . When the supercapacitor starts from 0 V and the input voltage is, say, 5 V, the full input-to-output voltage drop appears across…

Part Number: BQ25173 Yes, two BQ25173 devices can be paralleled to increase total output current (up to 1.6 A combined). The recommended method uses a slight offset in the output voltage setpoints between the two devices: one unit is set slightly higher…

Part Number: BQ25173 The BQ25173 does not have built-in cell balancing . For series-connected supercapacitors, external balancing resistors placed in parallel across each capacitor are the standard recommended approach. A single-cell supercap (rated…

Part Number: BQ25172 If no NTC temperature monitoring is needed, connect a 10 kOhm resistor from TS to GND . This biases the TS pin within the normal operating range (~350–380 mV with the internal 38 µA current source), preventing any false hot/cold…

Part Number: BQ25172 Charge current is set by a resistor to GND on the ISET pin: IOUT = KISET / RISET, where KISET = 300 ±10% (Ohms·mA) for the BQ2517x family. For example, RISET = 600ohms → IOUT ≈ 500mA. The ISET pin also serves as a real-time current…

Part Number: BQ25172 The VSET and TMR pins on all BQ2517x devices operate as digital bin systems , not analog. At startup, a calibrated current pulse is applied to the pin and the resulting voltage is measured and compared to a lookup table of predefined…

Part Number: BQ25172 Other Parts Discussed in Thread: BQ25176J The most common cause of the charge timer running longer than programmed is thermal regulation (TREG) . When the die temperature reaches the TREG threshold, the device: (1) reduces output…

Part Number: BQ25172 At power-up and after each charge cycle, the BQ25172 checks the battery voltage against VRECHG = 1.33V/cell : Battery voltage < VRECHG: Charging starts immediately (full charge cycle). Battery voltage > VRECHG: Battery is…

Part Number: BQ25172 Other Parts Discussed in Thread: BQ25171-Q1 , The BQ2517x NiMH chargers (BQ25172, BQ25171-Q1) use a timer-based termination method. Charging ends when: The safety/charge timer expires (set by TMR resistor; range 4–22 hours…