Datasheet

Data Sheet 71M6531D/F-71M6532D/F FDS 6531/6532 005
66 Rev 2
to the meter.
3.5 Connecting LCDs
The 71M6531D/F and 71M6532D/F have an on-chip LCD controller capable of controlling static or
multiplexed LCDs. Figure 32 shows the basic connection for an LCD.
The following dedicated and multi-use pins can be assigned as LCD segment pins for the 71M6531D/F:
• 12 dedicated LCD segment pins: SEG0 to SEG2, SEG7, SEG8, SEG12 to SEG18.
• 7 dual-function pins: SEG3/PCLK, SEG4/PSDO, SEG5/PCSZ, SEG6/PSDI, E_RXTX/SEG9,
E_TCLK/SEG10, and E_RST/SEG11.
• 14 combined DIO and segment pins: SEG24/DIO4 to SEG35/DIO15, SEG37/DIO17, SEG48/DIO28,
SEG49/DIO29 and SEG63/DIO43 to SEG66/DIO46.
The following dedicated and multi-use pins can be assigned as LCD segments for the 71M6532D/F:
• 15 dedicated LCD segment pins: SEG0 to SEG2, SEG8, SEG12 - SEG18, SEG20 - SEG23.
• 9 dual-function pins: MUX_SYNC/SEG7, E_RXTX/SEG9, E_TCLK/SEG10, E_RST/SEG11,
SEG3/PCLK, SEG4/PSDO, SEG5/PCSZ, SEG6/PSDI.
• 43 combined DIO and segment pins, as described in section 1.5.8.
.
Figure 32: Connecting LCDs
3.6 Connecting I
2
C EEPROMs
I
2
C EEPROMs or other I
2
C compatible devices should be connected to the DIO pins DIO4 and DIO5, as
shown in Figure 33.
Pull-up resistors of roughly 10 kΩ to V3P3D (to ensure operation in BROWNOUT mode) should be used
for both SCL and SDA signals. The DIO_EEX[1:0] register in I/O RAM must be set to 01 in order to convert
the DIO pins DIO4 and DIO5 to I
2
C pins SCL and SDA.
Figure 33: I
2
C EEPROM Connection
DIO4
DIO5
71M6531D/F
71M6532D/F
EEPROM
SCL
SDA
V3P3D
10 k
Ω
10 k
Ω
segments
71M6531D/F or 71M6532D/F
LCD
commons