71M6545 Datasheet, PDF (80/134 Pages) Maxim Integrated Products – Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size

Data Sheet 71M6545/H
PDS_6545_009
For a production meter, the RESET pin should be protected by the external components shown in
Figure 31, right side. R1 should be in the range of 100Ω and mounted as closely as possible to the IC.
Since the 71M6545/H generates its own power-on reset, a reset button or circuitry, as shown in Figure
31, is only required for test units and prototypes.
V3P3D
R₂
1k Ω
Reset
Switch
0.1µF
V3P3D
71M6545/H
10k Ω
R₁
RESET
GNDD
7711MM66554353/H
100Ω
R₁
RESET
DGND
Figure 31: External Components for the RESET Pin: Push-Button (Left), Production Circuit (Right)
4.10 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 Figure 32. Production boards should have the ICE_E pin connected to ground.
V3P3D
62 Ω
62 Ω
62 Ω
22 pF 22 pF 22 pF
71M6545/H
ICE_E
E_RST
E_RXT
E_TCLK
Figure 32: External Components for the Emulator Interface
4.11 Flash Programming
4.11.1 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.
4.11.2 Flash Programming via the SPI Port
It is possible to erase, read and program the flash memory of the 71M6545/H via the SPI port. See
2.5.12 for a detailed description.
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