LMP91000: LMP91000 bias in StandBy mode

xin he

Part Number: LMP91000

In the standby mode, the TIA is OFF, while the A1 control amplifier is ON. This mode of operation is suggested when the gas detector is not used for short amount of time and a faster warm-up of the gas detector is required.

According to the data, shorting CE and RE can measure the bias voltage, but the bias voltage disappears after entering the StandBy mode after setting the bias voltage.

address	value
0x00	0x00
0x01	0x00
0x10	0x05
0x11	0xdd
0x12	0x82

over 6 years ago

0 Ren Schackmann over 6 years ago

TI__Mastermind 43875 points

Hi Xin,

Our expert will get back to you on Monday, MST.

Thanks,
Ren

0 Jalen Tate89 over 6 years ago

TI__Genius 9675 points

Hi Xin,

Where are your measuring the bias voltage at?

Also, when measuring can you confirm that there is a voltage at Vref pin?

Jalen

0 xin he over 6 years ago in reply to Jalen Tate89

Prodigy 20 points

Short the CE and RE, measure the voltage between them and WE, as the bias voltage.No bias voltage measured after entering standby mode.What should I do next?

0 Jalen Tate89 over 6 years ago in reply to xin he

TI__Genius 9675 points

Xin,

When you are trying to measure the bias voltage, can you confirm that there is a voltage at Vref as well?

Jalen

0 Jalen Tate89 over 6 years ago in reply to Jalen Tate89

TI__Genius 9675 points

Xin,

Also, please try measuring between CE/RE and AGND pin for your bias voltage.

Jalen

0 Jalen Tate89 over 6 years ago in reply to Jalen Tate89

TI__Genius 9675 points

Xin,

Any update here? If not, I will assume your problem is fixed and close this thread.

Jalen

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LMP91000: LMP91000 bias in StandBy mode

According to the data, shorting CE and RE can measure the bias voltage, but the bias voltage disappears after entering the StandBy mode after setting the bias voltage.