M41TC8025 Highly accurate, temperature-compensated serial real-time clock (RTC) with embedded crystal Data brief Features ■ Embedded high-stability 32 KHz DTCXO ■ Temperature-compensated serial real-time clock – ±5.0 ppm max from -40 to 85 °C – ±3.8 ppm max from 0 to 50 °C ■ Supply voltage – Clock operating & timekeeping: 1.6 to 5.5 V – I2C interface operating: 1.8 to 5.5 V – Temperature compensation: 2.2 to 5.5 V ■ 0.8 µA typical current at 3.0 V supply voltage ■ 400 kHz I2C interface ■ Time-of-day alarm (with interrupt) ■ Fixed-cycle timer interrupt function ■ Time update interrupt function ■ Programmable frequency output – FOUT = 1 Hz, 1 KHz and 32 KHz ■ Registers for seconds, minutes, hours, day-ofweek, date (day of month), month and year with automatic leap year compensation ■ Programmable temperature compensation intervals (0.5 s, 2 s default, 10 s, 30 s) Description Power meters ■ Industrial applications Table 1. The M41TC8025 is a serial I2C real-time clock (RTC) incorporating temperature compensation to maintain accurate timekeeping over the industrial temperature range of -40 to +85 °C. In addition to providing date and time (seconds, minutes, hours, day-of-week, date (day of month), month and year), the device also provides an alarm function, fixed-cycle timer, time update interrupt and programmable frequency outputs (1 Hz, 1 KHz and 32 KHz). The M41TC8025 is provided in a 200 mil, 14-pin SOIC package. Applications ■ SO14 14-pin SOIC Device summary Order code Accuracy Package M41TC8025AMC6F ±5.0 ppm (-40 to 85 °C) ±3.8 ppm (0 to 50 °C) SO14 September 2012 Doc ID 023561 Rev 2 For further information contact your local STMicroelectronics sales office. 1/8 www.st.com 8 Device overview 1 M41TC8025 Device overview Figure 1. Logic diagram 6## 3#, )21 3$! &/54 &/% 633 !-V 1. IRQ is an open-drain output 2. FOUT is a CMOS output Figure 2. Pinout .# 3#, &/54 .& $5 6## &/% Table 2. Note: 2/8 .# 3$! .& 633 )21 .& .# !-V Pin description Pin Name Description 1 NC No connect. The NC pin can be connected to VCC, GND or left floating. 2 SCL Serial clock input 3 FOUT 4 NF No function. The NF pin can be connected to VCC, GND or left floating. 5 DU Do not use externally. The DU pin must be left floating. 6 VCC Power supply 7 FOE Frequency output enable, controls the frequency output on FOUT pin 8 NC No connect. The NC pin can be connected to VCC, GND or left floating. 9 NF No function. The NF pin can be connected to VCC, GND or left floating. 10 IRQ Interrupt output (open drain) 11 VSS Ground supply 12 NF No function. The NF pin can be connected to VCC, GND or left floating. 13 SDA Serial data input/output 14 NC No connect. The NC pin can be connected to VCC, GND or left floating. Programmable frequency output (CMOS). The FOUT pin is Hi-Z if FOE is low. Be sure to connect a 0.1 µF to 1 µF bypass capacitor between VCC and VSS. Doc ID 023561 Rev 2 M41TC8025 Figure 3. Device overview Block diagram INTERRUPT CONTROL TEMP SENSOR COMPENSATION CONTROL 32KHz TEMP-COMPENSATED OSC & CAPACITOR ARRAY UIE TIE AIE IRQ TIME UPDATE VCC 32KHz 32KHz 1KHz FIXED-CYCLE TIMER 1Hz DIVIDE BY 32768 ALARM COMPARE FOUT (SQW) FOE 1 Hz CLOCK REGISTERS SDA SCL SECONDS MINUTES HOURS DAY-OF-WEEK DATE MONTH YEAR I2C INTERFACE MIN Alarm HOUR Alarm DAY/WEEK Alarm DATE Alarm 0 - 59 COUNTER 0 - 59 COUNTER 0 - 23 COUNTER 1-7 COUNTER 1 - 12 COUNTER 0 - 99 COUNTER 1 - 31 ALARM REGISTERS TIMER COUNTER 0 TIMER COUNTER 1 EXTENSION REG FLAG REGISTER CONTROL REG VSS COUNTER NON-CLOCK REGISTERS AM045299v2 Figure 4. Hardware hookup 9&& %$7 9&& 6&/ 6&/ ,54 *3,2 6'$ 6'$ )2( 07& 0&8 )287 9VV !-V Doc ID 023561 Rev 2 3/8 Package mechanical data 2 M41TC8025 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 5. SO14 - 14-lead small outline (200 mils body width) package mechanical drawing 8348832_B 4/8 Doc ID 023561 Rev 2 M41TC8025 Table 3. Package mechanical data SO14 - 14-lead small outline (200 mils body width) package mechanical data mm in Symbol Min Typ Max Min Typ Max A - - 2.25 - - 0.089 A1 0.15 0.20 0.25 0.006 0.008 0.010 A2 1.80 1.90 2.00 0.071 0.075 0.079 A3 0.85 0.95 1.05 0.033 0.037 0.041 b 0.41 - 0.54 0.016 - 0.021 b1 0.40 0.45 0.50 0.016 0.018 0.020 c 0.14 - 0.21 0.006 - 0.008 c1 0.13 0.15 0.17 0.005 0.006 0.007 D1 9.80 9.90 10.00 0.386 0.390 0.394 D(1) 10.05 10.15 10.25 0.396 0.400 0.404 E 7.30 7.45 7.60 0.287 0.293 0.299 E1 5.20 5.30 5.40 0.205 0.209 0.213 e L 1.27 0.30 L1 0.50 0.050 0.70 0.012 1.07 ref. 0.020 0.028 0.042 ref. R 0.07 - - 0.003 - - R1 0.07 - - 0.003 - - θ1 0° - 8° 0° - 8° θ2 13° 15° 17° 13° 15° 17° θ3 6° 8° 10° 6° 8° 10° θ4 9.5° 11.5° 13.5° 9.5° 11.5° 13.5° θ5 6° 8° 10° 6° 8° 10° 1. Dimension “D” includes mold flash. Doc ID 023561 Rev 2 5/8 Part numbering 3 M41TC8025 Part numbering Table 4. Ordering information scheme Example: M41TC 8025 A MC 6 F Device family M41TC Device type 8025 Accuracy A = ±5.0 ppm (-40 to 85 °C) ±3.8 ppm (0 to 50 °C) Package MC = SO14 Temperature range 6 = –40 °C to 85 °C Shipping method F = ECOPACK® package, tape & reel For other options, or for more information on any aspect of this device, please contact the ST sales office nearest you. 6/8 Doc ID 023561 Rev 2 M41TC8025 4 Revision history Revision history Table 5. Document revision history Date Revision Changes 21-Aug-2012 1 Initial release. 21-Sep-2012 2 Modified title of document; updated Figure 3: Block diagram. 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