71M6521BE Datasheet, PDF (95/97 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
Digital Pins:
Name
Type Circuit Description
COM3, COM2,
COM1, COM0
SEG0…SEG18
SEG24/DIO4…
SEG31/DIO11
SEG34/DIO14…
SEG37/DIO17
E_RXTX/SEG38
E_RST/SEG32
E_TCLK/SEG33
ICE_E
CKTEST/SEG19
TMUXOUT
OPT_RX/DIO1
OPT_TX/DIO2
RESET
RX
TX
TEST
PB
X4MHZ
O
5 LCD Common Outputs: These 4 pins provide the select signals for the LCD display.
O
5 Dedicated LCD Segment Output.
Multi-use pins, configurable as either LCD SEG driver or DIO. (DIO4 = SCK, DIO5 =
I/O 3, 4, 5 SDA when configured as EEPROM interface, WPULSE = DIO6 when configured as
pulse outputs). If unused, these pins must be configured as outputs.
I/O
3, 4, 5
Multi-use pins, configurable as either LCD SEG driver or DIO. If unused, these
pins must be configured as outputs.
I/O 1, 4, 5
I/O
1, 4, 5
Multi-use pins, configurable as either emulator port pins (when ICE_E pulled high) or
LCD SEG drivers (when ICE_E tied to GND).
O
4, 5
ICE enable. When zero, E_RST, E_TCLK, and E_RXTX become SEG32, SEG33,
I
2
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 inter-
face in order to create a way for reprogramming parts that have the SECURE bit set.
O
4, 5
Multi-use pin, configurable as either Clock PLL output or LCD segment driver. Can
be enabled and disabled by CKOUT_EN.
O
4 Digital output test multiplexer. Controlled by TMUX[4:0].
Multi-use pin, configurable as either Optical Receive Input or general DIO. When
I/O
3, 4, 7
configured as OPT_RX, this pin receives a signal from an external photo-detector
used in an IR serial interface. If unused, this pin must be configured as an
output or terminated to V3P3D or GNDD.
Multi-use pin, configurable as either Optical LED Transmit Output, WPULSE,
I/O
3, 4
RPULSE, or general DIO. When configured as OPT_TX, this pin is capable of
directly driving an LED for transmitting data in an IR serial interface. If unused, this
pin must be configured as an output or terminated to V3P3D or GNDD.
This input pin resets the chip into a known state. For normal operation, this pin is
I
3 connected to GNDD. To reset the chip, this pin should be pulled high. No external
reset circuitry is necessary.
I
3 UART input. If unused, this pin must be terminated to V3P3D or GNDD.
O
4 UART output.
I
7 Enables Production Test. Must be grounded in normal operation.
Push button input. A rising edge sets the IE_PB flag and causes the part to wake up
I
3 if it is in SLEEP or LCD mode. PB does not have an internal pull-up or pull-down. If
unused, this pin must be terminated to GNDD.
I
3 This pin must be connected to GNDD.
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.
V1.0
© 2005-2008 TERIDIAN Semiconductor Corporation
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