MC34708 datasheet(28/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

Figure 5. SRTC Block Diagram

7.3.2.1

VSRTC

The VSRTC regulator provides the CLK32KMCU output level. Additionally, it is used to bias the Low Power SRTC domain of the

SRTC module integrated on certain FSL processors. The VSRTC regulator is enabled as soon as the RTCPORB is detected.

The VSRTC cannot be disabled.

Depending on the configuration of the PUMS[4:0] pins, the VSRTC voltage will be set to 1.3 or 1.2 V. With PUMS[4:0] = (0110,

0111, 1000, or 1001) VSRTC will be set to 1.3 V in on mode (on, on standby and on standby low power modes). In off and coin

cell modes the VSRTC voltage will drop to 1.2 V with the PUMS[4:0] = (0110, 0111, 1000, or 1001). With PUMS[4:0] ≠ (0110,

0111, 1000, or 1001), VSRTC will be set to 1.2 V for all modes (on, on standby, on standby low power mode, off, and coincell).

Table 16. VSRTC Electrical Specifications

Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C  TA  85 C, unless otherwise noted. Typical values

at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted.

Symbol

Characteristic

Min

Typ

Max

Unit

Notes

GENERAL

VSRTCIN

Operating Input Voltage Range VINMIN to VINMAX

• Valid Coin Cell range

•Valid BP

1.8

3.6

4.5

ISRTC

Operating Current Load Range ILMIN to ILMAX

0.0

A

COSRTC

Bypass Capacitor Value

0.1

F

VSRTC - ACTIVE MODE - DC

VSRTC

Output Voltage VOUT

•VINMIN < VIN < VINMAX

•ILMIN < IL < ILMAX

• Off and coincell mode

1.15

1.20

1.28

34708

VCOREDIG

PWRONx

SPIVCC=1.8 V

GP Domain=1.1 V

LP Dominant=1.2 V

VSRTC=1.2 V

CKIL: VSRTC

0.1

F

Coin Cell

Battery

Main

Battery

CLK32KMCU

VSRTC &

Detect

Best of

Supply

On/Off

Button

VCOREDIG

32 kHz

Open Drain output for RTC wake-up

Processor

I/O

Core Supply

SOG Supply

SRTC

HP-RC

LP-RTC

32 kHz for

DSM timing

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