78M6612 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
78M6612 Datasheet PDF : 46 Pages
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DS_6612_001
78M6612 Data Sheet
6.3 Digital Pins
Name
COM3,
COM2,
COM1,
COM0
SEG0…SEG18
Type
O
O
SEG24/DIO4… I/O
SEG31/DIO11
SEG34/DIO14 I/O
…
SEG37/DIO17,
SEG39/DIO19,
SEG40/DIO20
SEG41/DIO21 I/O
E_RXTX/SEG38 I/O
E_RST/SEG32
E_TCLK/SEG33 O
ICE_E
I
CKTEST/SEG19 O
TMUXOUT
O
RX1/DIO1
I/O
TX1/DIO2
I/O
DIO3
I/O
RESET
I
RX0
I
TX0
O
TEST
I
Circuit
5
5
3, 4, 5
3, 4, 5
3, 4, 5
1, 4, 5
4, 5
2
4, 5
4
3, 4, 7
3, 4
3, 4
3
3
4
7
Description
LCD common outputs: These four pins provide the select signals for the
LCD display.
Dedicated LCD segment output pins. SEG 14 and SEG15 are only
available on the 68-pin package.
Multi-use pins, configurable as either LCD SEG driver or DIO. (DIO4 =
SCK, DIO5 = SDA when configured as EEPROM interface, WPULSE =
DIO6, VARPULSE = DIO7 when configured as pulse outputs). If unused,
these pins must be configured as DIOs and set to outputs by the
firmware.
Multi-use pins, configurable as either LCD SEG driver or DIO. If unused,
these pins must be configured as DIOs and set to outputs by the
firmware.
Multi-use pins, configurable as LCD driver or DIO (QFN 68 package only).
If unused, this pin must be configured as a DIO and set to an output
by the firmware.
Multi-use pins, configurable as either emulator port pins (when ICE_E
pulled high) or LCD SEG drivers (when ICE_E tied to GND).
ICE enable. When zero, E_RST, E_TCLK, and E_RXTX become SEG32,
SEG33, and SEG38 respectively. For production units, this pin should be
pulled to GND to disable the emulator port. This pin should be brought out
to the programming interface in order to create a way for reprogramming
parts that have the SECURE bit set.
Multi-use pin, configurable as either Clock PLL output or LCD segment
driver. Can be enabled and disabled by CKOUT_E[1:0].
Digital output test multiplexer. Controlled by TMUX[4:0].
Multi-use pin, configurable as UART1 Input or general DIO. When con-
figured as RX1, this pin can optionally receive a signal from an external
photo-detector used in an IR serial interface. If unused, this pin must be
terminated to V3P3D or GNDD, or configured as a DIO and set to an
output by the firmware.
Multi-use pin, configurable as a transmit output from UART1 (or optionally
an Optical LED Transmit Output), WPULSE, RPULSE, or general DIO.
When configured as TX1, this pin is capable of directly driving an LED for
transmitting data in an IR serial interface. If unused, this pin must be left
open, or configured as a DIO and set to an output by the firmware.
DIO pin (QFN 68 package only)
This input pin resets the chip into a known state. For normal operation,
this pin is connected to GNDD. To reset the chip, this pin should be pulled
high. No external reset circuitry is necessary. Direct connect to ground in
normal operation.
UART input. If unused, this pin must be terminated to V3P3D or GNDD.
UART output.
Enables Production Test. Must be grounded in normal operation.
Pin types: P = Power, O = Output, I = Input, I/O = Input/Output
The circuit number denotes the equivalent circuit, as specified on the following page.
Rev 2
43
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