STM32W108CB STMicroelectronics, STM32W108CB Datasheet - Page 41

• Manufacturer Part Number: STM32W108CB
• Description: High-performance, IEEE 802.15.4 wireless system-on-chip with embedded Flash memory
• Manufacturer: STMicroelectronics

Specifications of STM32W108CB

• Receive Current (w/ Cpu): 27 mA
• Transmit Current (w/ Cpu, +3 Dbm Tx): 31 mA
• Low Deep Sleep Current, With Retained Ram And Gpio: 400 nA/800 nA with/without sleep timer
• Standard Arm Debug Capabilities: Flash patch & breakpoint; data watchpoint & trace; instrumentation trace macrocell
• Single Voltage Operation: 2.1-3.6 V with internal 1.8 V and 1.25 V regulators

STM32W108HB STM32W108CC STM32W108CB STM32W108CZ
6.3
Clocks
The STM32W108 integrates four oscillators:
●
●
●
●
Figure 7
shows all the clock sources and the general areas of the chip to which they are routed.
Figure 7.
digital in
32kHz
High frequency RC oscillator
24 MHz crystal oscillator
10 kHz RC oscillator
32.768 kHz crystal oscillator
12MHz
24MHz
XTAL
RC
Sleep Timer
Watchdog
counter
TIMx_SMCR[2:0]
counter
counter
TIMx
shows a block diagram of the clocks in the STM32W108. This simplified view
10kHz
32kHz
XTAL
RC
Clocks block diagram
OSCRC
OSC24M_CTRL[1]
TIMx_OR[1:0]
oscillator
OSC24M_CTRL[0]
(selects RC when
Failover monitor
SLEEPTMR _CFG[7:4]
SLEEPTMR _CLKEN[0]
XTAL fails )
(nominal 10)
/(2^N)
oscillator
/N
Doc ID 16252 Rev 13
OSC 24M
OSCHF
SLEEPTMR _CFG[0]
OSC32K
CLK1K
TIMxCLK
digital in
SCLK
/2
PCLK
CPU_CLKSEL[0]
DEBUG_EMCR[24]
FCLK
MAC Timer
AND
RATEGEN
counter
SCx
/2
System modules
Produces 6MHz
ADC_CFG[2]
or 1MHz
RAM CTRL
ST _CSR[2]
FLITF
SysTick
counter
CPU
SigmaDelta
bus
bus
TRACECLK
ADC
SCxSCLK
digital out
digital i /o
Flash
RAM
41/232