71M6511-IGT TERIDIAN [Teridian Semiconductor Corporation], 71M6511-IGT Datasheet - Page 51

• Manufacturer Part Number: 71M6511-IGT
• Description: Single-Phase Energy Meter IC
• Manufacturer: TERIDIAN [Teridian Semiconductor Corporation]

Power-Up: After power-up, the 71M6511/6511H is in reset as long as V1 < VBIAS. As soon as V1 exceeds VBIAS, the reset
timer is started which takes the MPU out of reset after 4100 oscillator cycles (see Figure 20). The MPU then initiates its pre-
boot phase lasting 32 cycles. The supply current will be low but not zero during power-up. It will increase, once V1 exceeds
VBIAS and will increase to the nominal value once the preboot phase starts. The supply current may then be reduced under
firmware control, following the steps specified in Battery Operation and Power Save Modes.
When V1 is lower than VBIAS, the external battery will power the following parts of the 71M6511/6511H:
In normal mode of operation, running on 3.3V supply, various resources of the 71M6511/6511H may be shut down by the MPU
firmware in order to reduce power consumption while other essential resources such as UARTs may remain active. Table 60
outlines these resources and their typical current consumption (based on initial condition MPU_DIV = 0).
*) This bit is to be used with caution! Inadvertently setting this bit will inhibit access to the part with the ICE interface and thus
preclude flash erase and programming operations.
Page: 51 of 95
POWER
DOWN
•
•
•
•
RTC
Crystal oscillator circuitry
MPU XRAM
WD_OVF bit
PWR
UP
Figure 20: Timing Diagram for Voltages, Current and Operation Modes after Power-Up
Power Saving Measure
Disable the CE
Disable the ADC
Disable clock test output CKTEST
Disable emulator clock
Set flash read pulse timing to 33 ns
Disable the LCD voltage boost circuitry
Disable RTM outputs
Increase the clock divider for the MPU
V2P5
V1
V1 > VBIAS
RESET TIMER
125ms
© 2005-2007 TERIDIAN Semiconductor Corporation
Table 60: Power Saving Measures
BOOT
PRE-
1ms
Power Save Modes
Battery Operation
V3P3
FIRMWARE HAS CONTROL OVER CHIP...
Single-Phase Energy Meter IC
SUPPLY CURRENT
Software Control
LCD_BSTEN = 0
ECK_DIS = 1 *)
CKOUTDIS = 1
FLASH66Z =1
MPU_DIV = X
ADC_DIS = 1
RTM_EN = 0
CE_EN = 0
71M6511/71M6511H
DATA SHEET
0.4mA/MHz
Savings
Typical
0.16mA
0.04mA
0.01mA
1.8mA
0.6mA
0.1mA
0.9mA
nominal
0mA
1.5V
3.3V
0V
AUGUST 2007
V2.6