STM32W108CBU61TR STMicroelectronics, STM32W108CBU61TR Datasheet - Page 53

• Manufacturer Part Number: STM32W108CBU61TR
• Description: 16/32-BITS MICROS
• Manufacturer: STMicroelectronics
• Series: STM32r

Specifications of STM32W108CBU61TR

• Applications: RF4CE, Remote Control
• Core Processor: ARM® Cortex-M3™
• Program Memory Type: FLASH (128 kB)
• Controller Series: STM32W
• Ram Size: 8K x 8
• Interface: I²C, SPI, UART/USART
• Number Of I /o: 24
• Voltage - Supply: 1.18 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-VFQFN Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

STM32W108CB, STM32W108HB
7
Integrated voltage regulator
The STM32W108 integrates two low dropout regulators to provide 1.8 V and 1.25 V power
supplies. The 1V8 regulator supplies the analog and memories, and the 1V25 regulator
supplies the digital core. In deep sleep the voltage regulators are disabled.
When enabled, the 1V8 regulator steps down the pads supply voltage (VDD_PADS) from a
nominal 3.0 V to 1.8 V. The regulator output pin (VREG_OUT) must be decoupled externally
with a suitable capacitor. VREG_OUT should be connected to the 1.8 V supply pins VDDA,
VDD_RF, VDD_VCO, VDD_SYNTH, VDD_IF, and VDD_MEM. The 1V8 regulator can
supply a maximum of 50 mA.
When enabled, the 1V25 regulator steps down VDD_PADS to 1.25 V. The regulator output
pin (VDD_CORE, (Pin 17) must be decoupled externally with a suitable capacitor. It should
connect to the other VDD_CORE pin (Pin 44). The 1V25 regulator can supply a maximum of
10 mA.
The regulators are controlled by the digital portion of the chip as described in
System
Table 5.
Supply range for regulator
1V8 regulator output
1V8 regulator output after reset
1V25 regulator output
1V25 regulator output after reset
1V8 regulator capacitor
1V25 regulator capacitor
1V8 regulator output current
1V25 regulator output current
No load current
1V8 regulator current limit
1V25 regulator current limit
modules.
Parameter
1.8 V integrated voltage regulator specifications
Doc ID 16252 Rev 8
Min.
-5%
-5%
-5%
-5%
2.1
0
0
Typ.
1.75
1.25
1.45
600
200
1.8
2.2
1.0
25
Max.
+5%
+5%
+5%
+5%
3.6
50
10
Units
mA
mA
mA
mA
Integrated voltage regulator
µA
µF
µF
V
V
V
VDD_PADS
Regulator output after
initialization
Regulator output after
reset
Regulator output after
initialization
Regulator output after
reset
Low ESR tantalum
capacitor
ESR greater than 2 Ω
ESR less than 10 Ω
De-coupling less than100
nF ceramic
Ceramic capacitor (0603)
Regulator output current
Regulator output current
No load current
(bandgap and regulators)
Short circuit current limit
Short circuit current limit
Comments
Section 6:
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