78M6612 Ver la hoja de datos (PDF) - Maxim Integrated

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78M6612

Single-Phase, Dual-Outlet Power and Energy Measurement IC

Maxim Integrated 

DS_6612_001

Table 3: DIO_DIR Control Bit

DIO Pin n Function

DIO_DIR [n]

0

1

Input

Output

78M6612 Data Sheet

Additionally, if DIO6 and DIO7 are declared outputs, they can be configured as dedicated pulse outputs

(WPULSE = DIO6, VARPULSE = DIO7) using DIO_PW and DIO_PV registers. In this case, DIO6 and

DIO7 are under CE control. DIO4 and DIO5 can be configured to implement the EEPROM Interface.

If the optical UART is not used, TX1 and RX1 can be configured as dedicated DIO pins (DIO1, DIO2, see

Section 1.5.6 Optical Interface).

A 3-bit configuration word, I/O RAM register, DIO_Rx (0x2009[2:0] through 0x200E[6:4]) can be used for

certain pins, when configured as DIO, to individually assign an internal resource such as an interrupt or a

timer control (see Table 2 for DIO pins available for this option). This way, DIO pins can be tracked even

if they are configured as outputs.

Tracking DIO pins configured as outputs is useful for pulse counting without external

hardware.

When driving LEDs, relay coils etc., the DIO pins should sink the current into ground (as

shown in Figure 3, right), not source it from V3P3D (as shown in Figure 3, left). This is due

to the resistance of the internal switch that connects V3P3D to either V3P3SYS or VBAT.

When configured as inputs, the dual-function (DIO/SEG) pins should not be pulled above

V3P3SYS in MISSION and above VBAT in LCD and BROWNOUT modes. Doing so will

distort the LCD waveforms of the other pins. This limitation applies to any pin that can be

configured as a LCD driver.

The control resources selectable for the DIO pins are listed in Table 4. If more than one input is

connected to the same resource, the resources are combined using a logical OR.

78M6612

V3P3SYS

VBAT

VT3P3D

D

DIO1

1

3.3V

R

LED

D

78M6612

V3P3SYS

VBA

VT3P3D

D

DIO1

1

R

DGND

D

DGND

D

Not recommended

Recommended

Figure 3: Connecting an External Load to DIO Pins

3.3V

LED

D

Rev 2

15

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