Other Parts Discussed in Thread: , BQ25606
Hello,
Trying to implement a BQ25616 solution for a standalone LiHV single cell (4.35V) battery charger. No system powering, just battery charging.
As opposite to BQ25616EVM, no separate leds for PGOOD and STATUS indication: I am using a single HE bicolor R and G led with common cathode.
Therefore, /PGOOD and /STAT pins both drive a PFET led driver, powered by System pin.
Q: what are the fault condition reported by the /STAT pin? Other than the ones in table 6 on page 26 of DS (input over-voltage, TS fault, safety timer fault or system over-voltage)?
Are
-Vvac<Vvac_present,
-Vbus<Vprsrc,
-Vvbus<Vvbus_uvloz
faults also reported by STAT pin?
In my prototype, when charger is powered with none of the above faults, with CE=0 but no battery present, /STAT blinks. Is that correct?
But blinking frequency in my case is around 15Hz when 5V<Vbus<5.8V, and around 6-7Hz when Vbus>6V. Much higher than the specified 1Hz STAT blinking, anyway.
Is that normal? No mention of that in the DS.
Can you please confirm?
If not, can you have a look at my schematics and maybe tell me where I went wrong?
My simple charger should have:
- no TS,
- no USB port power sink (no D+/D- detection),
- no USB port power source (no boost mode, OTG=0),
- Vreg=4.35V,
- Ichg=1.1A,
- Ilim=1.6A.
(please note that green led is much brighter than red one, thus much different series resistor values).
A few questions more, though:
- p.6 of DS, TS section:
"When TS pin is not used, connect a 10-kΩ resistor from REGN to TS and a 10-kΩ resistor from TS to GND or set TS_IGNORE to HIGH to ignore TS pin."
How and where can I set TS_IGNORE to HIGH as there is no communication with a host?
- p.8 of DS, Quiescent currents, Iq_BAT section:
"VBAT = 4.5V, VBUS floating or VBUS = 0V - 5V, SCL, SDA = 0V or 1.8V."
SCL and SDA?
Are those erroneous copy and paste from the DS of an I2C programmable chip?
Thanks a lot for your help.
Best Regards.
Matthieubq25616_single_cell_chrg.pdf
