71m6545h-igtr/f Maxim Integrated Products, Inc., 71m6545h-igtr/f Datasheet - Page 79

• Manufacturer Part Number: 71m6545h-igtr/f
• Description: Metrology Processors
• Manufacturer: Maxim Integrated Products, Inc.

PDS_6545_009
For the 71M6545H (±0.1% energy accuracy), coefficients specific to each individual device can be
calculated from values read from additional on-chip fuses that characterize the VREF behavior of each
individual part across industrial temperatures (see
The resulting tracking of the reference VREF voltage is within ±10 ppm/°C.
4.6
I
shown in
Pull-up resistors of roughly 10 kΩ to V3P3D should be used for both SDCK and SDATA signals. The
DIO_EEX (I/O RAM 0x2456[7:6]) field must be set to 01 in order to convert the DIO pins DIO2 and DIO3 to
I
4.7
µWire EEPROMs and other compatible devices should be connected to the DIO pins DIO2 and DIO3, as
described in
4.8
The UART0 RX pin should be pulled down by a 10 kΩ resistor and additionally protected by a 100 pF
ceramic capacitor, as shown in
4.9
Even though a functional meter does not necessarily need a reset switch, it is useful to have a reset
pushbutton for prototyping as shown in
V3P3SYS.
v1.0
2
2
C EEPROMs or other I
C pins SCL and SDATA.
Connecting I
Connecting Three-Wire EEPROMs
UART (TX/RX)
Connecting the Reset Pin
Figure
2.5.11 EEPROM Interface
29.
2
2
C compatible devices should be connected to the DIO pins DIO2 and DIO3, as
C EEPROMs
© 2008–2011 Teridian Semiconductor Corporation
71M6545/H
Figure
Figure 30: Connections for the UART
Figure 29: I
71M6545/H
Figure
30.
on page 57.
TX
DIO2
RX
DIO3
31, left side. The RESET signal may be sourced from
2
10 k Ω
C EEPROM Connection
4.5.3 Temperature Coefficients for the 71M6545H).
100 pF
10 k Ω
10 k Ω
EEPROM
SDCK
SDATA
V3P3D
TX
RX
Data Sheet 71M6545/H
79