參數(shù)資料
型號： 71M6541G-IGT/F
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 模擬信號調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PQFP64
封裝： LEAD FREE, LQFP-64
文件頁數(shù)： 68/165頁
文件大?。?/td> 2208K
代理商： 71M6541G-IGT/F
16
2008–2011 Teridian Semiconductor Corporation
v1.1
I/O RAM
Mnemonic
I/O RAM
Location
71M6541D/E
(hex)
71M6542F
(hex)
FIR_LEN[1:0]
210C[2:1]
1
ADC_DIV
2200[5]
1
PLL_FAST
2200[4]
1
MUX_DIV[3:0]
2100[7:4]
3
MUX0_SEL[3:0]
2105[3:0]
0
MUX1_SEL[3:0]
2105[7:4]
A
MUX2_SEL[3:0]
1
2104[3:0]
1
9
MUX3_SEL[3:0]
1
2104[7:4]
1
RMT_E
2709[3]
1
DIFFA_E
210C[4]
1
DIFFB_E
210C[5]
0
EQU[2:0]
2106[7:5]
0 or 1
0, 1 or 2
CE Code
--
CE41B016201
2
CE41B016601
3
Equations
--
0, 1
0, 1 and 2
Current Sensor Type
--
1 Local Shunt
and
1 Remote Shunt
1 Local Shunt
and
1 Remote Shunt
Applicable Figure
--
Notes:
1.
Although not used, set to 1 (the sample data is ignored by the CE)
2.
71M654x with 71M6201 remote sensor (200 Amps)
3.
71M654x with 71M6601 remote sensor (60 Amps)
TERIDIAN updates the CE code periodically. Please contact your local TERIDIAN representative
to obtain the latest CE code and the associated settings. The configuration presented in this table
is set by the MPU demonstration code during initialization.
Using settings for the I/O RAM Mnemonics listed in Table 1 and Table 2 that do not match
those required by the corresponding CE code being used results in undesirable side effects
and must not be selected by the MPU. Consult your local TERIDIAN representative to obtain
the correct CE code and AFE / MUX settings corresponding to the application.
For a basic single-phase application, the IAP-IAN current input is configured for differential mode,
whereas the VA pin is single-ended and is typically connected to the phase voltage via a resistor divider.
The IBP-IBN differential input may be optionally used to sense the Neutral current. This configuration
implies that the multiplexer applies a total of three inputs to the ADC. For this configuration, the
multiplexer sequence is as shown in Figure 6. In this configuration IAP-IAN, IBP-IBN and VA are
sampled, the extra conversion time slot (i.e., slot 2) is the optional Neutral current, and the physical
current sensor for the Neutral current measurement may be omitted if not required.
For a standard single-phase application with tamper sensor in the neutral path, two current inputs can be
configured for differential mode, using the pin pairs IAP-IAN and IBP-IBN. This means that the multiplexer
applies a total of three inputs to the ADC. In this application, the system design may use two locally
connected current sensors via IAP-IAN and IBP-IBN, as shown in Figure 2, and configured as differential
inputs. Alternately, the IAP-IAN pin pair is configured as a differential input and connected to a local current
shunt, and IBP-IBN is configured to connect to an isolated 71M6x01 isolated sensor (i.e., RMT_E = 1), as
shown in Figure 3. The VA pin is typically connected to the phase voltage via resistor dividers. For this
configuration, the multiplexer frame is also as shown in Figure 6 and time slot 2 is unused and ignored by
the CE, as the samples corresponding to the remote sensor (IBP-IBN) do not pass through the
multiplexer and are stored directly in CE RAM. The remote current sensor channel is sampled during the
second half of the multiplexer frame and its timing relationship to the VA voltage is precisely known so
that delay compensation can be properly applied.
The 71M6542F adds the ability to sample a second phase voltage (applied at the VB pin), which makes it
suitable for meters with two voltage and two current sensors, such as meters implementing Equation 2 for
dual-phase operation (P = VA*IA+VB*IB). Figure 7 shows the multiplexer sequence when four inputs are
processed with locally connected sensors, as shown in Figure 3. When using one local and one remote
sensor (Figure 5), the multiplexer sequence is also as shown in Figure 7.
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