71M6541DSLASHFSLASHG datasheet(102/166 Pages) MAXIM

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71M6541D/F/G and 71M6542F/G Data Sheet

102

Rev 5

Figure 41: Connection for Optical Components

4.12

Connecting the Reset Pin

Even though a functional meter does not necessarily need a reset switch, it is useful to have a reset

pushbutton for prototyping as shown in Figure 42, left side. The RESET signal may be sourced from

V3P3SYS (functional in MSN mode only), V3P3D (MSN and BRN modes), or VBAT (all modes, if a

battery is present), or from a combination of these sources, depending on the application.

For a production meter, the RESET pin should be protected by the external components shown in

Figure 42, right side. R1 should be in the range of 100

Ω and mounted as closely as possible to the IC.

Since the 71M6541D/F/G and 71M6542F/G generate their own power-on reset, a reset button or circuitry, as

shown in Figure 42, is only required for test units and prototypes.

Figure 42: External Components for the RESET Pin: Push-Button (Left), Production Circuit (Right)

RESET

71M654x

GNDD

V3P3D

VBAT/

V3P3D

Reset

Switch

Ω

0.1µF

10kΩ

OPT_TX

OPT_RX

71M654x

V3P3SYS

Phototransistor

LED

10 k

Ω

100 pF

V3P3SYS

71M654x

GNDD

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