Solder Bridges; Table 6. Solder Bridges - STMicroelectronics UM1079 User Manual

UM1079
4.8

Solder bridges

SB18,20
(X3 crystal)
SB7,9,11,13
(DEFAULT)
SB6,8,10,12
(RESERVED)
SB1,2,14
(IDD_Measurement)
SB15,16
(X2 crystal)
(B2-RESET)
(B1-USER)
(VDD powered from 3 V)
(Battery enable)
SB100 (NRST)
SB101 (SWO)
SB102 (STM_RST)
Bridge State
ON
(2)
OFF
ON
OFF
ON
OFF
OFF
ON
ON
SB5
OFF
ON
SB4
OFF
ON
SB21
OFF
OFF
SB22
ON
ON
OFF
ON
OFF
OFF
ON
DocID018789 Rev 4

Table 6. Solder bridges

(1)
PH0, PH1 are connected to P1 (X3, C21, C22, R30 must not
be fitted).
X3, C21, C22 and R30 provide a clock as shown in
Electrical schematics.
PH0, PH1 are disconnected from P1.
Reserved, do not modify.
Reserved, do not modify.
PA0, PA4, PC13 are used by the I
JP1 ON.
PA0, PA4, PC13 are available and IDD module cannot be
used JP1 OFF.
X2, C16, C17 and R28 deliver a 32 KHz clock.
PC14, PC15 are not connected to P1.
PC14, PC15 are only connected to P1. Do not remove X2,
C16, C17, R28.
B2 Pushbutton is connected to the NRST pin of the
STM32L152 MCU.
B2 Pushbutton is not connected the NRST pin of the
STM32L152 MCU.
B1 Pushbutton is connected to PA0.
B1 Pushbutton is not connected to PA0.
V is powered from 3 V, SB22 must be OFF.
DD
V is not powered from 3 V, SB22 must be ON.
DD
V is not powered by the CR2032 battery, SB21 must be
DD
ON.
V is powered by the CR2032 battery, SB21 must be OFF.
DD
The NRST signal of the CN2 connector is connected to the
NRST pin of the STM32L152RCT6.
The NRST signal of the CN2 connector is not connected to the
NRST pin of the STM32L152RCT6.
The SWO signal of the CN2 connector is connected to PB3.
The SWO signal is not connected.
No incidence on STM32L152RCT6 NRST signal.
STM32L152RCT6 NRST signal is connected to GND.
Hardware and layout
Description
measurement.
DD
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