STEVAL-SCM001V1 STMicroelectronics, STEVAL-SCM001V1 Datasheet - Page 28

• Manufacturer Part Number: STEVAL-SCM001V1
• Description: KIT DEMO DONGLE RTC M41T62/ST7
• Manufacturer: STMicroelectronics

Specifications of STEVAL-SCM001V1

• Design Resources: STEVAL-SCM001V1 Gerber Files STEVAL-SCM001V1/RTC Schematic
• Main Purpose: Timing, ARM7 based RTC USB Dongle
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: M41T62, ST72F651
• Primary Attributes: RTC (Real-Time Clock) and Mass Storage Capabilities
• Secondary Attributes: Graphical User Interface, USB Interface
• Silicon Manufacturer: ST Micro
• Silicon Core Number: M41T62 And ST72651AR6
• Kit Application Type: Clock & Timing
• Application Sub Type: RTC Dongle
• Kit Contents: Board CD Docs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5684

Clock operation
3.6
3.7
28/43
Square wave output (M41T62/63/64)
The M41T62/63/64 offers the user a programmable square wave function which is output on
the SQW pin. RS3-RS0 bits located in 04h establish the square wave output frequency.
These frequencies are listed in
completed, the SQW pin can be turned on and off under software control with the square
wave enable bit (SQWE) located in register 0Ah.
The SQW output is an N-channel, open drain output driver for the M41T64, and a full CMOS
output driver for the M41T62/63. The initial power-up default for the SQW output is 32 KHz
(except for M41T64, which defaults disabled).
Table 8.
Full-time 32 KHz square wave output (M41T64)
The M41T64 offers the user a special 32 KHz square wave function which is enabled on
power-up to output on the F
(ST bit = '0'). This function is available within one second (typ) of initial power-up and can
only be disabled by setting the 32KE bit to '0' or the ST bit to '1.' If not used, the F
should be disconnected and allowed to float.
RS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Square wave output frequency
RS2
Square wave bits
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
32K
Doc ID 10397 Rev 15
Table
pin as long as V
RS1
8. Once the selection of the SQW frequency has been
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
CC
≥ 1.3 V, and the oscillator is running
RS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Frequency
32.768
8.192
4.096
2.048
1.024
None
512
256
128
64
32
16
8
4
2
1
Square wave
M41T62/63/64/65
32K
Units
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
–
pin