ST7L15 datasheet(101/138 Pages) STMICROELECTRONICS

101 / 138 page

ST7L15, ST7L19

101/138

OPERATING CONDITIONS (cont’d)

The RC oscillator and PLL characteristics are temperature-dependent.

13.3.1.1 Operating Conditions (tested for TA = -40 to +125°C) @ VDD = 4.5 to 5.5V

Notes:

1. If the RC oscillator clock is selected, to improve clock stability and frequency accuracy, it is recommended to place a

decoupling capacitor, typically 100nF, between the VDD and VSS pins as close as possible to the ST7 device.

2. See “INTERNAL RC OSCILLATOR ADJUSTMENT” on page 21.

3. Minimum value is obtained for hot temperature and max value is obtained for cold temperature.

4. Data based on characterization results, not tested in production

5. Measurement made with RC calibrated at 1 MHz.

6. Guaranteed by design.

7. Averaged over a 4ms period. After the LOCKED bit is set, a period of tSTAB is required to reach ACCPLL accuracy.

8. After the LOCKED bit is set ACCPLL is maximum 10% until tSTAB has elapsed. See Figure 11 on page 22.

Figure 61. Typical Accuracy with RCCR = RCCR0 vs VDD = 4.5 to 5.5V and Temperature

Symbol

Parameter

Conditions

Min

Typ

Max Unit

fRC

Internal RC oscillator frequency

RCCR = FF (reset value), TA = 25°C, VDD = 5V

700

kHz

RCCR = RCCR02 ), TA = 25°C, VDD = 5V

992

1000

1008

ACCRC

Accuracy of Internal RC oscillator

with RCCR = RCCR02)3)

TA = 25°C, VDD = 5V

-0.8

+0.8

TA = 25°C, VDD = 4.5 to 5.5V

-1

TA = -40 to +125°C, VDD = 4.5 to 5.5V

-3.5

IDD(RC)

RC oscillator current consumption

TA = 25°C, VDD =5V

6004)5)

µA

tsu(RC)

RC oscillator setup time

102)

µs

fPLL

x8 PLL input clock

1MHz

tLOCK

PLL Lock time8)

tSTAB

PLL Stabilization time8)

ACCPLL x8 PLL Accuracy

fRC =1 MHz @ TA = 25°C, VDD = 4.5 to 5.5V

0.17)

fRC =1 MHz @ TA = -40 to +125°C, VDD =5V

0.17)

JITPLL

PLL jitter (

∆f

CPU/fCPU)1

IDD(PLL) PLL current consumption

TA = 25°C

6004)

µA

-1.00%

-0.50%

0.00%

0.50%

1.00%

1.50%

2.00%

2.50%

3.00%

3.50%

4.5

4.6

4.7

4.8

4.9

5.1

5.2

5.3

5.4

5.5

Vdd (V)

-45

-10

110

130

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