78M6612-IMSLASHFSLASHP datasheet(72/111 Pages) TERIDIAN

72 / 111 page

78M6612 Data Sheet

DS_6612_001

Rev. 1.2

V3P3

100pF

GND

V3P3

100pF

GND

Figure 36: Voltage Divider for V1

Even though a functional power and measurement unit will not necessarily need a reset switch, it is

useful to have a reset pushbutton switch for prototyping, as shown in Figure 37, left side. The RESET

signal may be sourced from V3P3SYS (functional in MISSION mode only), V3P3D (MISSION and

BROWNOUT modes), VBAT (all modes, if battery is present), or from a combination of these sources,

depending on the application. For a production unit, the RESET pin should be protected by the external

components shown in Figure 37, right side. R1

Since the 78M6612 generates its own power-on reset, a reset button or circuitry, as shown in

should be in the range of 100

Ω and mounted as closely

as possible to the IC. The RESET pin can also be directly connected to ground.

Figure 37, left side, is only required for test units and prototypes.

Figure 37: External Components for RESET: Development Circuit (Left), Production Circuit

(Right)

3.12 Connecting the Emulator Port Pins

Capacitors to ground must be used for protection from EMI. Production boards should have the ICE_E

pin connected to ground.

If the ICE pins are used to drive LCD segments, the pull-up resistors should be omitted, as shown in

Figure 38, and 22 pF capacitors to GNDD should be used for protection from EMI.

It is important to bring out the ICE_E pin to the programming interface in order to create a way

for reprogramming parts that have the Flash SECURE bit (SFR 0xB2[6]) set. Providing access to

ICE_E ensures that the part can be reset between erase and program cycles, which will enable

programming devices to reprogram the part. The reset required is implemented with a watchdog timer

reset (i.e. the hardware WDT must be enabled).

RESET

78M6612

DGND

V3P3

Reset

Switch

1nF

10k

DGND

V3P3

VBAT/

V3P3

Reset

Switch

1nF

10k

100

RESET

78M6612

DGND

100

78M6612-IM/F/P Datasheet(PDF) 72 Page - Teridian Semiconductor Corporation

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