Difference u1700 (u2) and u1401 - GSM-Forum

short_toground · 08-10-2016, 13:31

Can someone explain the difference between these two chips? They're both for charging? What about q1403

aaronharr52 · 08-11-2016, 07:13

I think that u1401 gets power from the battery and u1700 is attached to charger. Not 100 percent sure tho

short_toground · 08-11-2016, 14:24

So u1401 controls u1700? As in provides power to it then u1700 handles charging?

short_toground · 08-27-2016, 19:21

Anyone else? Does u1401 control power to u1700 so it can charge the battery?

Kradziej · 08-27-2016, 20:31

u2 detects when lightning plug is connected and communicates with it (there is ic inside the plug) through 1-wire SDQ serial interface to set up charging. u2 is also an usb mux and it forwards usb connecton from computer to cpu. It can also forward connection to debug interfaces but you need special factory cable for it.

u1700 is a muscle of charging. It takes power from 5.0v line and puts proper voltage on vcc_main to maintain 4-phase battery charging. u1700 is probably autonomous in charging, charger control loops parameters are set through i2c interface and information about battery status (gas gauge) goes from u1700 to cpu through 1-wire HDQ.

short_toground · 08-27-2016, 21:36

Isn't u2 just another name for u1700? What does u1401 and q1403 do?

Kradziej · 08-27-2016, 21:48

u2 in ip5/5c/5s and in ip6 and so its u1700, tristar ic
u1401 is a tigris charger ic

short_toground · 08-27-2016, 22:00

Quote:

Originally Posted by Kradziej

u2 in ip5/5c/5s and in ip6 and so its u1700, tristar ic
u1401 is a tigris charger ic

That's what confuses me, if u1401 is charger ic does that mean u1700 Tristar doesn't handle charging?

Kradziej · 08-27-2016, 22:12

Quote:

Originally Posted by short_toground

That's what confuses me, if u1401 is charger ic does that mean u1700 Tristar doesn't handle charging?

u1700 only handles communication with lighting cable because without proper authentication from lighting cable tigris (u1401) will not start charging battery

short_toground · 08-27-2016, 23:08

Quote:

Originally Posted by Kradziej

u1700 only handles communication with lighting cable because without proper authentication from lighting cable tigris (u1401) will not start charging battery

Perfect thanks. Now it makes sense. Everyone always talking about u2/Tristar/u1700 as the charge ic it confused me

orx · 08-29-2016, 08:36

if someone has been helping leaves a thanks you opened many posts for questions and help and you never thanked anyone, read the forum rules.

short_toground · 09-13-2016, 17:13

Quote:

Originally Posted by Kradziej

u1700 only handles communication with lighting cable because without proper authentication from lighting cable tigris (u1401) will not start charging battery

Which line on u1700 talks to u1401 to authenticate charging?

08-10-2016, 13:31	#1 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	Difference u1700 (u2) and u1401 Can someone explain the difference between these two chips? They're both for charging? What about q1403

08-11-2016, 07:13	#2 (permalink)
aaronharr52 Insane Poster Join Date: Apr 2016 Posts: 59 Member: 2557340 Status: Offline Thanks Meter: 4	I think that u1401 gets power from the battery and u1700 is attached to charger. Not 100 percent sure tho

08-11-2016, 14:24	#3 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	So u1401 controls u1700? As in provides power to it then u1700 handles charging?

08-27-2016, 19:21	#4 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	Anyone else? Does u1401 control power to u1700 so it can charge the battery?

08-27-2016, 20:31	#5 (permalink)
Kradziej Freak Poster Join Date: Sep 2015 Posts: 198 Member: 2453408 Status: Offline Thanks Meter: 63	u2 detects when lightning plug is connected and communicates with it (there is ic inside the plug) through 1-wire SDQ serial interface to set up charging. u2 is also an usb mux and it forwards usb connecton from computer to cpu. It can also forward connection to debug interfaces but you need special factory cable for it. u1700 is a muscle of charging. It takes power from 5.0v line and puts proper voltage on vcc_main to maintain 4-phase battery charging. u1700 is probably autonomous in charging, charger control loops parameters are set through i2c interface and information about battery status (gas gauge) goes from u1700 to cpu through 1-wire HDQ.

08-27-2016, 21:36	#6 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	Isn't u2 just another name for u1700? What does u1401 and q1403 do?

08-27-2016, 21:48	#7 (permalink)
Kradziej Freak Poster Join Date: Sep 2015 Posts: 198 Member: 2453408 Status: Offline Thanks Meter: 63	u2 in ip5/5c/5s and in ip6 and so its u1700, tristar ic u1401 is a tigris charger ic

08-29-2016, 08:36	#11 (permalink)
orx No Life Poster Join Date: Oct 2012 Location: Republic of Serenissima Posts: 1,516 Member: 1825965 Status: Offline Thanks Meter: 874	if someone has been helping leaves a thanks you opened many posts for questions and help and you never thanked anyone, read the forum rules.