TMP103: I2C Speed Support

Allan Fan

Part Number: TMP103

Hi experts,

From TMP103 datasheet table 1 timing definition, it seems that the device supports high speed mode with a clock rate up to 3.4Mhz. However, it does not show to support fast mode plus at 1Mhz?

Technically, 3.4Mhz is faster than 1Mhz. Could you clarify if tmp103 support fast mode plus? And what's timing spec?

If not, could you explain why it's capable for high speed mode but wouldn't support fast mode plus? Is this due to the different hardware requirements (such as drive strength or timing logic) between fm+ and hs-mode?

BR,

Allan

4 months ago

0 HarryG 4 months ago

TI__Expert 7190 points

Hello Allan,

Since the TMP103 hardware can support High Speed Mode, it should also be able to support Fast Mode Plus without any modifications to the setup.

Regards,

Harry

0 YI YUN LIN 3 months ago

Prodigy 10 points

Hi Harry,

We need the RX specification for the thermal sensor at 1 MHz. Please confirm whether the data below meets your requirements.

Symbol	Parameter	Test Result		Unit
Symbol	Parameter	Min	Max	Unit
fSCL	SCL clock frequency	0.909	0.914	MHz
tHD;STA	hold time START/RESTART condition	348.786	348.786	ns
tLOW	LOW period of the SCL clock	550.677	555.646	ns
tHIGH	HIGH period of the SCL clock	520.124	522.732	ns
tHD;DAT	data hold time	97.301	103.442	ns
tSU;DAT	data set-up time	424.913	454.397	ns
tSU;STO	set-up time for STOP condition	5815.833	5815.833	ns
tSU;STA	set-up time for a repeated START condition	5809.646	5809.646	ns
tr-SCL	rise time of SCL signals	17.829	23.614	ns
tr-SDA	rise time of SDA signals	23.044	23.044	ns
tf-SCL	fall time of SCL signals	1.294	1.388	ns
tf-SDA	fall time of SDA signals	1.687	1.733	ns
tVD;DAT	data valid time	99.029	126.487	ns
tVD;ACK	data valid acknowledge time	244.18	244.18	ns

0 HarryG 3 months ago in reply to YI YUN LIN

TI__Expert 7190 points

Hello YI YUN LIN,

From my observation, I don't see anything concerning with the data collected. The most important parameters that must be adhered to are the data hold time (HDDAT) and data setup time (SUDAT) and the values observed in your setup comply with what's provided in the datasheet.

Regards,

Harry

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TMP103: I2C Speed Support