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UM0542 Bill of materials and assembly instructions
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6.3 Assembly information for serial memory
1. When U13 LD2980CMxx is not assembled, use R130 instead. All mentioned memories
should be able to operate on 3.3 V. Use a voltage regulator for low voltage memories.
2. U7 supports the following series of STMicroelectronics™ memories:
M95xx - Serial SPI Bus EEPROM
M25xx - Serial SPI Bus Flash memory
M34xx - Serial I
2
C Bus EEPROM
Table 6. Voltage regulator for analog MEMS
(1)
Label Comment Footprint Description Assembled Order code
U10 LD2980CMxx SOT23-5L Voltage regulator No ST: LD2980CMxx
R100 0
Ω
0603 Resistor Yes GM
®
: R0603-0R
C100 1 µF 0805 Pol. capacitor No Farnell: 422-7086 (X7R)
C101 2.2 µF 1206 Pol. capacitor No Farnell: 422-7323 (X7R)
C102 10 nF 0603 Capacitor No Farnell: 422-6938 (X7R)
C103 10 µF 3528_AB Pol. capacitor Yes
Farnell: 331-3888
B45196H2106K109
1. By default, the voltage regulator is not assembled.
Table 7. Voltage regulator for digital MEMS
(1)
Label Comment Footprint Description Assembled Order code
U11 LD2980Cxx SOT23-5L Voltage regulator No ST: LD2980Cxx
R110 0
Ω
0603 Resistor Yes GM: R0603-0R
C110 1 µF 0805 Pol. capacitor No Farnell: 422-7086 (X7R)
C111 2.2 µF 1206 Pol. capacitor No Farnell: 422-7323 (X7R)
C112 10 µF 0603 Capacitor No Farnell: 422-6938 (X7R)
1. By default, the voltage regulator is not assembled.
Table 8. Voltage regulator for memory
(1)
Label Comment Footprint Description Assembled Order code
U13 LD2980CMxx SOT23-5L Voltage regulator No ST: LD2980CMxx
R130 0
Ω
0603 Resistor Yes GM: R0603-0R
C130 1 µF 0805 Pol. capacitor No Farnell: 422-7086 (X7R)
C131 2.2 µF 1206 Pol. capacitor No Farnell: 422-7323 (X7R)
C132 10 nF 0603 Capacitor No Farnell: 422-6938 (X7R)
1. By default, the voltage regulator is not assembled.
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