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71M6513/71M6513H
A Maxim Integrated Products Brand
3 -Phase      Energy Meter IC
DATA SHEET
SEPTEMBER 2011
Battery
The VBAT pin provides an input for an external battery that can be used to support the crystal oscillator, RTC, the WD_OVF bit
and XRAM in the absence of the main power supply. If the battery is not used, the VBAT pin should be connected to V3P3.
Internal Voltages (VBIAS, VBAT, V2P5)
The 71M6513 requires two supply voltages, V3P3A, for the analog section, and V3P3D, for the digital section. Both voltages
can be tied together outside the chip. The internal supply voltage V2P5 is generated by a regulator from the 3.3V supplies.
The battery voltage, VBAT, is required when crystal oscillator, RTC and XRAM are required to keep operating while V3P3D is
removed (battery mode). VBAT, usually supplied by an external battery, powers crystal oscillator, RTC and XRAM (and the
WD_OVF bit).
VBIAS (1.5V) is generated internally and used for the comparators V1, V2 and V3.
Test Ports
TMUXOUT Pin: One out of 16 digital or 4 analog signals can be selected to be output on the TMUXOUT pin. The function of
the multiplexer is controlled with the I/O RAM register TMUX (0x2000[3:0]), as shown in Table 57.
TMUX [3:0]
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Mode
analog
analog
analog
analog
digital
digital
digital
digital
digital
digital
digital
digital
--
digital
digital
digital
Function
DGND
IBIAS
PLL_2.5V
VBIAS
RTM (Real time output from CE)
WDTR_EN (Comparator 1 Output AND V1LT3)
V2_OK (Comparator 2 Output)
V3_OK (Comparator 3 Output)
RXD (from Optical interface)
MUX_SYNC
CK_10M
CK_MPU
reserved for production test
RTCLK
CE_BUSY
XFER_BUSY
Table 57: TMUX [3:0] Selections
Emulator Port: The emulator port, consisting of the pins E_RST, E_TCLK and E_RXTX provides control of the MPU through
an external in-circuit emulator. The E_TBUS[3:0] pins, together with the E_ISYNC/BRKRQ add trace capability to the
emulator. The emulator port is compatible with the ADM51 emulators manufactured by Signum Systems.
The signals of the emulator port have weak pull-ups. Adding 1k ? pull-up resistors on the PCB is recommended.
Real-Time Monitor: The RTM output of the CE is available as one of the digital multiplexer options. RTM data is read from the
CE DRAM locations specified by I/O RAM registers RTM0 , RTM1 , RTM2 , and RTM3 after the rise of MUX_SYNC. The RTM can
be enabled and disabled with I/O RAM register RTM_EN . The RTM output is clocked by CKTEST. Each RTM word is clocked
? 2005-2011 Teridian Semiconductor Corporation
Page: 47 of 104
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