71m6543h-igtr/f Maxim Integrated Products, Inc., 71m6543h-igtr/f Datasheet - Page 95

• Manufacturer Part Number: 71m6543h-igtr/f
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

4.11 Connecting the Emulator Port Pins
Even when the emulator is not used, small shunt capacitors to ground (22 pF) should be used for protection
from EMI as illustrated in
4.12 Flash Programming
4.12.1 Flash Programming via the ICE Port
Operational or test code can be programmed into the flash memory using either an in-circuit emulator or
the Flash Programmer Module (TFP-2) available from Teridian. The flash programming procedure uses
the E_RST, E_RXTX, and E_TCLK pins.
4.12.2 Flash Programming via the SPI Port
It is possible to erase, read and program the flash memory of the 71M6543F/H via the SPI port. See
2.5.12
4.13 MPU Demonstration Code
All application-specific MPU functions mentioned in
demonstration C source code supplied by Teridian. The code is available as part of the Demonstration Kit
for the 71M6543F/H. The Demonstration Kits come with the 71M6543F/H preprogrammed with
demonstration firmware and mounted on a functional sample meter Demo Board. The Demo Boards allow
for quick and efficient evaluation of the IC without having to write firmware or having to supply an in-circuit
emulator (ICE).
4.14 Crystal Oscillator
The oscillator of the 71M6543F/H drives a standard 32.768 kHz watch crystal. The oscillator has been
designed specifically to handle these crystals and is compatible with their high impedance and limited
power handling capability. The oscillator power dissipation is very low to maximize the lifetime of any
battery backup device attached to the VBAT_RTC pin.
Board layouts with minimum capacitance from XIN to XOUT require less battery current. Good layouts
have XIN and XOUT shielded from each other and also keep the XIN and XOUT traces short and away
from LCD and digital signals.
v1.0
for a detailed description.
Since the oscillator is self-biasing, an external resistor must not be connected across the crystal.
Figure 37: External Components for the Emulator Interface
62 Ω
62 Ω
Figure
V3P3D
© 2008–2011 Teridian Semiconductor Corporation
62 Ω
37. Production boards should have the ICE_E pin connected to ground.
22 pF
LCD Segments
22 pF
(optional)
22 pF
4 Application Information
71M6543F/H
ICE_E
E_RST
E_RXT
E_TCLK
are featured in the
71M6543F/H Data Sheet
95