M48T201Y-70MH1E STMicroelectronics, M48T201Y-70MH1E Datasheet - Page 21

• Manufacturer Part Number: M48T201Y-70MH1E
• Description: IC SUPERVISOR TIMEKPR 5V 44-SOH
• Manufacturer: STMicroelectronics
• Series: Timekeeper®r
• Type: Clock/Calendar/NVSRAMr

Specifications of M48T201Y-70MH1E

• Memory Size: External
• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 44-SOH
• Number Of Voltages Monitored: 1
• Monitored Voltage: 3.3 V, 5 V
• Manual Reset: Not Resettable
• Watchdog: Watchdog
• Battery Backup Switching: Backup
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Supply Current (typ): 15000 uA
• Maximum Power Dissipation: 1000 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Power Fail Detection: Yes
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-2840-5; M48T201Y-70MH1

M48T201Y, M48T201V
Note:
3.7
In order to perform a software reset of the watchdog timer, the original timeout period can be
written into the watchdog register, effectively restarting the countdown cycle.
Should the watchdog timer time out, and the WDS bit is programmed to output an interrupt,
a value of 00h needs to be written to the watchdog register in order to clear the IRQ/FT pin.
This will also disable the watchdog function until it is again programmed correctly. A READ
of the flags register will reset the watchdog flag (bit D7; register 7FFF0h).
The watchdog function is automatically disabled upon power-down and the watchdog
register is cleared. If the watchdog function is set to output to the IRQ/FT pin and the
frequency test function is activated, the watchdog or alarm function prevails and the
frequency test function is denied.
The user must transition the address (or toggle chip enable) to see the flag bit change.
Square wave output
The M48T201Y/V offers the user a programmable square wave function which is output on
the SQW pin. RS3-RS0 bits located in 7FFF0h 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 7FFF6h.
Table 7.
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
Table
RS1
7. 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
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
Hi-Z
512
256
128
64
32
16
8
4
2
1
Square wave
Clock operation
Units
kHz
kHz
kHz
kHz
kHz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
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