参数资料
型号: 71M6511-DB
厂商: Maxim Integrated Products
文件页数: 58/115页
文件大小: 0K
描述: BOARD DEMO 71M6511 ENERGY METER
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: 71M6511
已供物品: 2 个板,线缆,CD,电源
71M6511/71M6511H Demo Board User’s Manual
2.4
SCHEMATIC INFORMATION
In this section, hints on proper schematic design are provided that will help designing circuits that are
functional and sufficiently immune to EMI (electromagnetic interference).
2.4.1 COMPONENTS FOR THE V1 PIN
The V1 pin of the 71M6511/6511H can never be left unconnected.
A voltage divider should be used to establish that V1 is in a safe range when the meter is in mission mode
(V1 must be lower than 2.9V in all cases in order to keep the hardware watchdog timer enabled). For proper
debugging or loading code into the 71M6513 mounted on a PCB, it is necessary to have a provision like the
header JP1 shown above R1 in Figure 2-7. A shorting jumper on this header pulls V1 up to V3P3 disabling
the hardware watchdog timer.
JP1
V3P 3
D10
R1
10K
2
HDR 1x2
1
L1
V1
UCLAMP3301D
R2
21.5K
FERRITE
C1
10uF
C2
1000pF
GND
Figure 2-7: Voltage Divider for V1
On the 6511 Demo Boards this feature is implemented with resistors R83/R86, capacitor C34 (2-Layer
Demo Board only) and TP10. See the board schematics in the Appendix for details.
2.4.2 RESET CIRCUIT
Even though a functional meter will not necessarily need a reset switch, the 71M6511 Demo Boards provide
a reset pushbutton that can be used when prototyping and debugging software. When a circuit is used in an
EMI environment, the RESETZ pin should be supported by the external components shown in Figure 2-8. R 1
should be in the range of 200 ? , R 2 should be around 10 ? . The capacitor C 1 should be 1nF. R1 and C1
should be mounted as close as possible to the IC. In cases where the trace from the pushbutton switch to
the RESETZ pin poses a problem, R 2 can be removed.
V3P3
SW1
PB-SW
R3
10
R2
0
R1
200
RESETZ
C2
0.1uF
C1
1000pF
GND
Figure 2-8: External Components for RESETZ
Page: 58 of 115
? 2005-2007 TERIDIAN Semiconductor Corporation
Revision 5.4
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