Other Parts Discussed in Thread: LMP8601-Q1, LMP8601, LMP8602-Q1, LMP8602, LMP8603,
Hi,
I am planning to use this part to monitor the current flowing into a negative power supply. While reading the datasheet, I am a bit confused by the following paragraph on page29 regarding Figure 63 in the data sheet (version: SNOSAR2H - revised APRIL 2016)
"If the load current of the battery is higher then the charging current, the output voltage of the LMP860x and LMP860x-
Q1 will be above the half offset voltage for a net current flowing out of the battery. When the charging current is
higher then the load current the output will be below this half offset voltage."
I would think when a net current flowing out of the battery, then +IN (Vp) < -IN(Vn) in Figure 63 and the LMP860x-Q1 output would be below the half offset voltage.
Otherwise, this paragraph appears to contradict the paragraph on page 19 as
"Examples:
• LMP8601, LMP8601-Q1: A 5-V supply, a gain of 20x, OFFSET pin tied to VS, and a differential input signal of
10 mV results in 2.7 V at the output pin. Similarly, –10 mV at the input results in 2.3 V at the output pin.
• LMP8602, LMP8602-Q1: A 5-V supply, a gain of 50x, and a differential input signal of 10 mV results in 3.0 V
at the output pin. Similarly, –10 mV at the input results in 2.0 V at the output pin.
• LMP8603, LMP8603-Q1: A 5-V supply, a gain of 100x, and a differential input signal of 10 mV results in 3.5 V
at the output pin. Similarly, –10 mV at the input results in 1.5 V at the output pin.(1) (1)"
In addition to the above question, is there any other particular things I should consider or be aware when I use this to monitor the current flowing from a device to the negative power supply?
Kind Regards,
John