71M6531D_10 Datasheet, PDF (114/120 Pages) Teridian Semiconductor Corporation – Energy Meter IC

Data Sheet 71M6531D/F-71M6532D/F
FDS 6531/6532 005
5.9.3 Digital Pins
Table 92: Digital Pins
Name
Type Circuit
Description
COM3,COM2,
COM1,COM0
O
5
LCD Common Outputs: These 4 pins provide the select signals for
the LCD display.
SEG0…SEG2,
SEG7, SEG8
O
SEG12…SEG18
5 Dedicated LCD Segment Output pins.
SEG20…SEG23 O
5 Dedicated LCD Segment Output pins (71M6532D/F only).
SEG24/DIO4…
SEG35/DIO15,
Multi-use pins, configurable as either LCD SEG driver or DIO.
SEG37/DIO17,
(DIO4 = SCK, DIO5 = SDA when configured as EEPROM interface;
SEG48/DIO28, I/O 3, 4, 5 WPULSE = DIO6, VARPULSE = DIO7 when configured as pulse
SEG49/DIO29,
SEG63/DIO43…
outputs). Unused pins must be configured as outputs or terminated
to V3P3/GNDD.¹⁾
SEG66/DIO46
SEG3/PCLK
SEG4/PSDO
SEG5/PCSZ
SEG6/PSDI
I/O 3, 4, 5 Multi-use pins, configurable as either LCD SEG driver or SPI PORT.
E_RXTX/SEG9
E_RST/SEG11
E_TCLK/SEG10
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_E
ICE enable. When zero, E_RST, E_TCLK and E_RXTX become
I
2 SEG32, SEG33 and SEG38 respectively. For production units, this
pin should be pulled to GND to disable the emulator port.
CKTEST/SEG19,
MUXSYNC/SEG7
O
Multi-use pins, configurable as either multiplexer/clock output or LCD
4, 5 segment driver using the I/O RAM registers CKOUT_E or
MUX_SYNC_E.
TMUXOUT
O
4 Digital output test multiplexer. Controlled by TMUX[3:0].
OPT_RX/DIO1
Multi-use pin, configurable as Optical Receive Input or general DIO.
I/O
3, 4, 7
When configured as OPT_RX, this pin receives a signal from an external
photo-detector used in an IR serial interface. If this pin is unused it
must be configured as an output or terminated to V3P3D or GNDD.
OPT_TX/DIO2
Multi-use pin, configurable as either optical LED transmit output,
I/O
3, 4
WPULSE, 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.
RESET
Chip reset: This input pin is used to reset the chip into a known state.
I
2
For normal operation, this pin is pulled low. To reset the chip, this pin
should be pulled high. This pin has an internal 30 μA (nominal) current
source pull-down. No external reset circuitry is necessary.
RX
I
3
UART input. If this pin is unused it must be configured as an
output or terminated to V3P3D or GNDD.
TX
O
4 UART output.
TEST
I
7
Enables Production Test. This pin must be grounded in normal
operation.
Push button input. This pin must be at GNDD when not active. A
PB
I
3
rising edge sets the IE_PB flag. It also causes the part to wake up if it
is in SLEEP or LCD mode. PB does not have an internal pull-up or
pull-down.
1) _{Not all pins available on the 71M6531D/F or 71M6532D/F.}
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