+IN

-IN

OUT

1

2

6

V

-

1/50

+

±

+IN

-IN

OUT

1

2

6

V

-

1/50

+

±

+IN

-IN

OUT

1

2

6

V

-

1/50

+

±

+IN

-IN

OUT

1

2

6

V

-

1/50

+

±

+IN

-IN

OUT

1

2

6

+

±

+IN

-IN

OUT

1

2

6

+

±

LMP8358

SNOSB09B – APRIL 2010 – REVISED MARCH 2013

www.ti.com

Table 9. Input Multiplexer and Polarity (Register bits 8:6) (continued)

MUX1

MUX0

Diff Input for POL = 0

Diff Input for POL = 1

0

1

1

0

1

1

Polarity Reversal

When MUX[1:0] = 00b and POL = 0b the LMP8358 has the input of a normal instrumentation amplifier. The input

thermocouple voltages, residual offset of the LMP8358, or offsets of the sensor or ADC.

Short Inputs

When MUX[1:0] = 01b and POL = 0b both inputs are connected to the +IN pin of the LMP8358. The –IN pin is

left floating. When MUX[1:0] = 01b and POL = 1b both inputs are connected to the -IN pin of the LMP8358. The

+IN pin is left floating.

Compare Input to V-

When MUX[1:0] = 10b or 11b one external input of the LMP8358 is floating. The other external input is divided by

50 as shown in Table 9. The internal instrumentation amplifier input that is not connected to the external pin is

depending on what the gain is set to with G[2:0] bits as shown in Table 10.

Table 10. Overall Gain using G[2:0], MUX[1:0] and POL

G[2:0]

MUX[1:0]

Overall System Gain

POL = 0b

POL = 1b

000b

10b or 11b

0.2

−0.2

001b

10b or 11b

0.4

−0.4

010b

10b or 11b

1

−1

011b

10b or 11b

2

−2

100b

10b or 11b

4

−4

101b

10b or 11b

10

−10

110b

10b or 11b

20

−20

26

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