参数资料
型号: 71M6531F-DB
厂商: Maxim Integrated Products
文件页数: 55/121页
文件大小: 0K
描述: BOARD DEMO 71M6531F
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1
主要目的: 电源管理,电度表/功率表
嵌入式:
已用 IC / 零件: 71M6531
主要属性: 单相功率表
已供物品: 2 个板,线缆,CD,电源
FDS 6531/6532 005
Data Sheet 71M6531D/F-71M6532D/F
2.2
System Timing Summary
Figure 19 s ummarizes the timing relationships between the input MUX states, the CE_BUSY signal and
the two serial output streams. In this example, MUX_DIV[3:0] = 4 and FIR_LEN[1:0] = 2 (384 CE cycles,
3 CK32 cycles per conversion), resulting in 13 CK32 cycles per multiplexer frame. Generally, the duration
of each MUX frame is:
?
?
?
1 + MUX_DIV * 1, if FIR_LEN[1:0] = 0 (138 CE cycles)
1 + MUX_DIV * 2, if FIR_LEN[1:0] = 1 (288 CE cycles)
1 + MUX_DIV * 3, if FIR_LEN[1:0] = 2 (384 CE cycles).
An ADC conversion will always consume an integer number of CK32 clocks. Following this is a single
CK32 cycle where the bandgap voltage is allowed to recover from the change in CROSS.
ADC TIMING
CK32
MUX_SYNC
150
ADC MUX Frame
MUX_DIV =4 (4 conversions) is shown
Settle
MUX STATE
S
0
1
2
3
S
ADC EXECUTION
CE TIMING
CE_EXECUTION
0
ADC0
450
ADC1
900
ADC2
1350
ADC3
1800
CE_BUSY
XFER_BUSY
CK COUNT = CE_CYCLES + floor((CE_CYCLES + 2) / 5)
MAX CK COUNT
NOTES:
INITIATED BY A CE OPCODE AT END OF SUMMATION INTERVAL
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 ( PRE_SAMPS * SUM_CYCLES ) CODE PASSES.
Figure 19: Timing Relationship between ADC MUX, Compute Engine
Each CE program pass begins when the ADC0 conversion (for IA) begins. Depending on the length of
the CE program, it may continue running until the end of the last conversion (ADC3). CE opcodes are
constructed to ensure that all CE code passes consume exactly the same number of cycles. The result of
each ADC conversion is inserted into the RAM when the conversion is complete. The CE code is written
to tolerate sudden changes in ADC data. The exact clock count when each ADC value is loaded into
RAM is shown in Figure 19.
Figure 20 shows that the serial data stream, RTM, begins transmitting at the beginning of state S. RTM,
consisting of 140 CK cycles, will always finish before the next code pass starts.
CK32
MUX_SYNC
CKTEST
TMUXOUT/RTM
FLAG
0
1
30
31
FLAG
0
1
30
31
FLAG
0
1
30
31
FLAG
0
1
30
31
RTM DATA 0 (32 bits)
RTM DATA 1 (32 bits)
RTM DATA 2 (32 bits)
RTM DATA 3 (32 bits)
Figure 20: RTM Output Format
Rev 2
55
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