TPS2543: Discharge Function

Kotaro Yamashita

Part Number: TPS2543

Hi Team,

I have questions about discharge function as below. Could you support?

Q1: Figure38. on D/S mentioned "Not SDP1", "Not CDP Or SDP2" and "Not SDP2 Or CDP" routes back to Discharge block. Does these comments mean failuer hand-shake between TPS2543's CTL setting and device?

Q2: When following condition is applied, does discharge function work? Is there other conditions?

　1. EN pin: Hi -> Low

2. UVLO

3. CTL1-3: (000)

4. POR

Regards,

Kotaro Yamashita

over 6 years ago

0 Kevin-Cheng over 6 years ago

TI__Expert 3135 points

Hi Kotaro,
A1: We also need to consider the DCP mode
A2: The discharge function works under the for condition you said, in addition to, the discharge function also works during the CTL switching(mode switch)
Best Regards,
Kevin

0 Kotaro Yamashita over 6 years ago in reply to Kevin-Cheng

TI__Intellectual 2600 points

Hi Kevin,

Q1-1: DCH flow from SDP1, CDP and CDP2
Do "Not SDP1", "Not CDP Or SDP2" and "Not SDP2 Or CDP" mean failur of hand-shake?

Q1-2: DCH flow from DCP
What does "DCH/SDP/CDP" flow on Figure 38 mean?

Q2: Thanks. I understood.

Regards,
Kotaro Yamashita

0 Kevin-Cheng over 6 years ago in reply to Kotaro Yamashita

TI__Expert 3135 points

Hi Kotaro Yamashita,
A1-1: when reset, it will flow to SDP1,CDP,SDP2,DCP Forced, DCP_auto. If none of these cases is identified, mean failure of hand-shake. Sure, you said "Not SDP1", "Not CDP Or SDP2" and "Not SDP2 Or CDP" means failure this hand-shake failure.
A1-2: DCH/SDP/CDP means "NOT DCP" or "NOT DCP Auto"
Kevin

0 Kotaro Yamashita over 6 years ago in reply to Kevin-Cheng

TI__Intellectual 2600 points

Hi Kevin,

Thanks. Let me clarify;

1. When mode is CDP, if I select change CTL1-3 as 1110(SDP2), the flow is:
CDP -> SDP2 (without DCH)

2. When mode is SDP2, if I select change CTL1-3 as 110x(SDP1), the flow is:
SDP2 -> Not SDP2 Or CDP -> Discharge -> DCH Done -> Sample CTL Pins -> SDP1

3. When mode is DCP Auto, if I change CTL1-3 as 1110(SDP2), the flow is:
DCP Auto -> DCH/SDP/CDP -> Discharge -> DCH Done -> Sample CTL Pins -> SDP2

Is my understanding correct?

Regards,
Kotaro Yamashita

0 Kevin-Cheng over 6 years ago in reply to Kotaro Yamashita

TI__Expert 3135 points

Hi Kotaro Yamashita，
sorry for late reply, your understanding is right.
Kevin

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TPS2543: Discharge Function