Si4438-C

8

Rev 1.0

Table 5. Auxiliary Block Specifications1

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Temperature Sensor

Sensitivity

—

4.5

—

ADC

Codes/

°C

Low Battery Detector

Resolution

—50

—

mV

Microcontroller Clock

Output Frequency Range2

Configurable to Fxtal or Fxtal

divided by 2, 3, 7.5, 10, 15, or

30 where Fxtal is the reference

XTAL frequency. In addition,

32.768 kHz is also supported.

32.768K

—

Fxtal

Hz

Temperature Sensor

Conversion

Programmable setting

—

3

—

ms

XTAL Range3

25

—

32

MHz

30 MHz XTAL Start-Up Time

Using XTAL and board layout in

reference design. Start-up time

will vary with XTAL type and

board layout.

—

300

—

μs

30 MHz XTAL Cap

Resolution

—70

—

fF

32 kHz XTAL Start-Up Time

—

2

—

sec

32 kHz Accuracy using

Internal RC Oscillator

—

2500

—

ppm

POR Reset Time

——

6

ms

Notes:

1. All minimum and maximum values are guaranteed across the recommended operating conditions of supply voltage and

2. Microcontroller clock frequency tested in production at 1 MHz, 30 MHz, 32 MHz, and 32.768 kHz. Other frequencies

tested in bench characterization.

3. XTAL Range tested in production using an external clock source (similar to using a TCXO).