参数资料
型号: 71M6542F-IGT/F
厂商: Maxim Integrated
文件页数: 26/166页
文件大小: 0K
描述: IC ENERGY METERING
标准包装: 90
系列: *
71M6541D/F/G and 71M6542F/G Data Sheet
equivalent to 203 ns) and contains a leading flag bit. See Figure 10 for the RTM output format. RTM is
low when not in use.
Figure 11 summarizes the timing relationships between the input MUX states, the CE_BUSY signal, and
the RTM serial output stream. In this example, MUX_DIV[3:0] = 4 (I/O RAM 0x2100[7:4]) and
FIR_LEN[1:0] = 10 (I/O RAM 0x210C[1]), (384), resulting in 4 ADC conversions. An ADC conversion
always consumes an integer number of CK32 clocks. Followed by the conversions is a single CK32
cycle.
Figure 11 also shows that the RTM serial data stream begins transmitting at the beginning of state S.
RTM, consisting of 140 CK cycles, always finishes before the next CE code pass starts.
CK32
MUX_SYNC
MUX_STATE
CKTEST
S
RTM
0
1
30
31
0
1
30
31
0
1
30
31
0
1
30
31
FLAG
FLAG
FLAG
FLAG
RTM DATA0 (32 bits)
RTM DATA1 (32 bits)
RTM DATA2 (32 bits)
RTM DATA3 (32 bits)
Figure 10: RTM Timing
ADC MUX Frame
ADC TIMING
CK32
MUX_SYNC
150
MUX_DIV Conversions, MUX_DIV =4 is shown
Settle
MUX STATE
S
0
1
2
3
S
ADC EXECUTION
ADC0
ADC1
ADC2
ADC3
CE TIMING
0
450
900
1350
1800
CE_EXECUTION
CE_BUSY
XFER_BUSY
RTM TIMING
CK COUNT = CE_CYCLES + 1CK for each ADC transfer
INITIATED BY A CE OPCODE AT END OF SUM INTERVAL
MAX CK COUNT
140
RTM
NOTES:
1. ALL DIMENSIONS ARE 5MHZ CK COUNTS.
2. THE PRECISE FREQUENCY OF CK IS 150*CRYSTAL FREQUENCY = 4.9152MHz.
3. XFER_BUSY OCCURS ONCE EVERY SUM_SAMPS CODE PASSES.
Figure 11: Timing Relationship Between ADC MUX, CE, and RTM Serial Transfer
26
Rev 4
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