SMM605

Preliminary Information

Summit Microelectronics, Inc

2064 1.1 09/16/03

11

READY

START

J1

Ext VRef

C6 1uF

R4 10K

R1 10K

J1

1

2

3

4

5

6

7

8

9

10

Gnd

SCL

Gnd3

SDA

Rsrv5

MR

+10V

Rsrv8

+5V

Rsrv10

R2 10K

C6

0.1uF

C8

0.1uF

The SMM605 and the DC-DC Converter

Can Operate with either 12V or VDD

If 12V is used, VDD can be left floating

If VDD is used, 12V can be left floating

D1

DIODE

If the SMM605 internal VREF

is used, the VREF_CNTL pin

becomes an output

C4

0.1uF

DC-DC ENABLE

+12VIN (+6V to +14V)

SMX3200 I2C

Programming

Connector 10

pin Header

C1

0.1uF

C2

0.1uF

R3 10K

U4

LM4121

1

3

4

5

Ref

EN

VIn

VOut

C5

0.02uF

U1

SMM605

2

3

4

7

15

1

SCL

A2

START

READY

FILT_CAP

VMX

TRIM_CAPX

TRIMX

SDA

Vdd

U2

DC-DC Converter

1

2

3

4

7

8

9

10

11

+Vout

+Vout

Sense

+Vout

+Vin

+Vin

+Vin

Trim

Enable

C3

0.01uF

VDD (+2.7V to +5.5V)

VOUT

J2

Supply

C7

0.01uF

Figure 7 – SMM605 Applications schematic. The accuracy of the external (U4) or internal reference sets the

accuracy of the ADOC function. Total accuracy with a ±0.1% external reference is ±0.2% and ±0.5% with the

internal reference. The 12V supply can go as low as 6V if the internal regulator is set to 3.6V.

APPLICATIONS INFORMATION (CONTINUED)