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71M6545/71M6545H Data Sheet
6.2
Recommended External Components
Table 79: Recommended External Components
Name
C1
C2
CSYS
CVDD
XTAL
CXS
CXL
From
V3P3A
V3P3D
V3P3SYS
VDD
XIN
XIN
XOUT
To
GNDA
GNDD
GNDD
GNDD
XOUT
GNDA
GNDA
Function
Bypass capacitor for 3.3 V supply
Bypass capacitor for 3.3 V output
Bypass capacitor for V3P3SYS
Bypass capacitor for VDD
32.768 kHz crystal – electrically
equivalent to ECS .327-12.5-17X or
Vishay XT26T, load capacitance 12.5 pF
Load capacitor values for crystal depend
on crystal specifications and board
parasitics. Nominal values are based on
4 pF board capacitance and include an
allowance for chip capacitance.
Value
≥ 0.1 ± 20%
0.1 ± 20%
≥ 1.0 ± 30%
0.1 ± 20%
32.768
15 ± 10%
10 ± 10%
Unit
μ F
μ F
μ F
μ F
kHz
pF
pF
6.3
Recommended Operating Conditions
Unless otherwise specified, all parameters listed under 6.4 Performance Specifications and 6.5 Timing
Specifications are valid over the Recommended Operating Conditions provided in Table 80 below.
Table 80: Recommended Operating Conditions
Parameter
V3P3SYS and V3P3A Supply Voltage for precision
metering operation (MSN mode). Voltage at
VBAT_RTC need not be present.
VBAT_RTC Voltage. VBAT_RTC is not needed to
support the RTC and non-volatile memory unless
V3P3SYS<2.0 V
Operating Temperature
Condition
VBAT_RTC =0 V to
3.8 V
V3P3SYS<2.0 V
Min
3.0
2.0
-40
Typ
Max
3.6
3.8
+85
Unit
V
V
oC
Notes:
1. GNDA and GNDD must be connected together.
2. V3P3SYS and V3P3A must be connected together.
114
v2
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