SH3003 datasheet(7/30 Pages) SEMTECH

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POWER MANAGEMENT

SH3003

POWER MANAGEMENT

Pin Descriptions (continued)

Pin Name

Type

Pin Function

9RREF

Analog

Optional 1MΩ external bias resistor for internal 32.768 kHz RC oscillator. Can

be used to set, trim or modulate the internal RC oscillator. Keep open if not

used.

NRST

Digital Out

Active low system reset output. Asserted with a strong low state when a reset

condition occurs. Weakly pulled to VDD internally when not active. This signal is

valid for VDD as low as 1V. Keep open if not used.

RST

Digital Out

Active high system reset output. Asserted with a strong high state when a reset

condition occurs. Weakly pulled to VSS internally when not active. This signal is

valid for VDD as low as 1 V. Keep open if not used.

TEST (VSS)

Digital In

Factory test enable. All VSS pins & TEST (VSS) pin must be connected together.

CLK32

Digital Out

Buffered internal 32.768 kHz clock, derived according to the CLKSEL pin setting.

Pin uses backup power for the buffer when VDD is not present. When driving

high, this signal is either at VBAK or VDD (if VDD is higher than the reset threshold).

When enabled, this signal runs continuously independent of CLKOUT activity.

Minimize the external load to reduce power consumption during backup opera-

tions. When disabled, this pin is driven to VSS. Keep open if not used.

IO/INT

I/O

Serial communications interface and interrupt output pin. Pin is internally weakly

pulled to opposite of programmed interrupt polarity. If interrupt is programmed to

be active low, pin is weakly pulled to VDD when inactive. Keep open if not used.

CLKIN

Digital In

Clock activity sense input. Detects when target microcontroller enters stop mode

(which disables its clock). Connect to the microcontroller’s clock output or oscil-

lator output pin. Connect to VSS when not used. CLKIN must not be left open.

CLKOUT

Digital Out

Programmable high frequency clock output. Connect to the target microcon-

troller’s clock input or oscillator input pin. Keep open if not used.

Thermal Pad

Pad for heatsinking purposes. Connect to ground plane using multiple vias. Not

connected internally.

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