78M6612-IMSLASHFSLASHP datasheet(73/111 Pages) TERIDIAN

73 / 111 page

DS_6612_001

78M6612 Data Sheet

Rev. 1.2

Figure 38: External Components for the Emulator Interface

3.13 Crystal Oscillator

The oscillator of the 78M6612 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 VBAT.

Board layouts with minimum capacitance from XIN to XOUT will require less battery current. Good

layouts will have XIN and XOUT shielded from each other.

Since the oscillator is self-biasing, an external resistor must not be connected across

the crystal.

3.14 Flash Programming

Operational or test code can be programmed into the Flash memory using either an in-circuit emulator or

the Flash Programmer Module (TFP-1) available from Teridian. The Flash programming procedure uses

the E_RST, E_RXTX, and E_TCLK pins.

3.15 MPU Firmware Library

All application-specific MPU functions mentioned above under “Application Information” are available from

Teridian as a standard ANSI C library and as ANSI “C” source code. The code is available as part of the

Demonstration Kit for the 78M6612 IC. The Demonstration Kits come with the 78M6612 IC

preprogrammed with demo firmware mounted on a functional sample PCB (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).

3.16 Measurement Calibration

Once the 78M6612 Power and Energy Measurement device has been installed in a measurement

system, it is typically calibrated for tolerances of the current sensors, voltage dividers and signal

conditioning components. The device can be calibrated using the gain and phase adjustment factors

accessible to the CE. The gain adjustment is used to compensate for tolerances of components used for

signal conditioning, especially the resistive components. Phase adjustment is provided to compensate

for phase shifts introduced by certain types of current sensors.

Due to the flexibility of the MPU firmware, any calibration method, such as calibration based on energy, or

current and voltage can be implemented. It is also possible to implement segment-wise calibration

(depending on current range).

The 78M6612 supports common industry standard calibration techniques, such as single-point

(energy-only), multi-point (energy, Vrms, Irms), and auto-calibration.

E_RST

E_RXTX

E_TCLK

22pF

LCD Segments

(optional)

ICE_E

V3P3D

E_RST

78M6612

E_RXTX

E_TCLK

22pF

LCD Segments

(optional)

ICE_E

V3P3D

78M6612-IM/F/P Datasheet(PDF) 73 Page - Teridian Semiconductor Corporation

78M6612-IM/F/P Datasheet(HTML) 73 Page - Teridian Semiconductor Corporation

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