71M6521BE Datasheet, PDF(51/97 Page) Teridian Semiconductor Corporation

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71M6521BE Datasheet, PDF (51/97 Pages) Teridian Semiconductor Corporation – Energy Meter IC

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71M6521BE

Energy Meter IC

DATA SHEET

JANUARY 2008

LCD Mode

In LCD mode, the data contained in the LCD_SEG registers is displayed, i.e. up to four LCD segments connected to each of the

pins SEG18 and SEG19 can be made to blink without the involvement of the MPU, which is disabled in LCD mode. The

V3P3D output pin is inactive in LCD mode.

This mode can be exited only by system power up, a timeout of the wake-up timer, or a push button. Figure 20 shows the

functional blocks active in LCD mode.

SLEEP Mode

In SLEEP mode, the battery current is minimized and only the Oscillator is active. The V3P3D output pin is inactive in LCD

mode. This mode can be exited only by system power-up, a timeout of the wake-up timer, or a push button event. Figure 21

shows the functional blocks active in SLEEP mode.

Circuit Function

CE Data RAM

FIR

Analog circuits:

PLL, ADC, VREF, BME, etc.

MPU clock rate

MPU_DIV

ICE

DIO Pins

Watchdog Timer

LCD

EEPROM Interface (2-wire)

EEPROM Interface (3-wire)

UART

Optical TX modulation

Flash Read

Flash Page Erase

Flash Write

RAM Read and Write

Wakeup Timer

Crystal oscillator

DRAM data preservation

V3P3D voltage output

System Power

MISSION

Yes

4.92MHz

(from PLL)

Yes

Battery Power (nonvolatile Supply)

BROWNOUT

Yes

LCD

SLEEP

28.672kHz

(7/8 of 32768Hz)

Yes

Yes (8kb/s)

Yes (16kb/s)

Yes

Table 59: Available Circuit Functions (âââ means ânot active)

V1.0

Page: 51 of 97

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