AS1860 datasheet(7/51 Pages) ETC2

7 / 51 page

AS1860

Akros Silicon, Inc.

6399 San Ignacio Avenue, Suite 250, San Jose, CA 95119 USA

408.746.9000



http://www.AkrosSilicon.com

VDD3V_OUT

Primary-side supply voltage source (3.3 volts). This supply can be used for additional

external circuits on the primary side that are referenced to 48N, see Electrical Characteristics

for supply limits.

VDD3V_IN

Primary-side input supply voltage (3.3 volts) normally connected to VDD3_OUT.

VDD5I

Low power node that can be used to supply 48RTN referenced devices, see Electrical

Characteristics for supply limits. Must be decoupled with an external capacitor.

I, PU

PD Controller state machine Power-on-Reset, connect to 48RTN with external capacitor.

Primary-Side: DC-DC Controller

CSS

Primary-side PWM Soft Start input, decouple to 48N with an external capacitor.

GATE

Primary-side external Power FET gate drive.

ISENSEP

Current sense input, also used to set Primary PWM current limit (with external resistor).

SYNC_DLY

Along with SYNC_OVL this signal sets Primary and Secondary-side primary sync delay

timing for Output #1. Connecting a resistor to ground (48N) from this input will optimize

output efficiency for a given PD power level or Sync Power-FET choice. See Table 19 for

resistor value selection and other details.

SYNC_OVL

Along with SYNC_DLY this signal sets Primary and Secondary-side primary sync overlap

timing for Output #1. Connecting a resistor to ground (48N) from this input will optimize

output efficiency for a given PD power level or Sync Power-FET choice. See Table for

resistor value selection and other details.

Primary-Side: Clock Dividers

PRI_DIV

A, I

Primary PWM frequency divider input. Connect an external resistor (5%) from this input to

ground to set the Primary PWM clock divider. Used in either internal or external (if the

CLK_IN input is active) clocking operation.

Note that the Primary PWM clocking rate is a function of both PRI_DIV and SEC_DIV divider

ratios. See Device Description, Figure 4 and Table 17 for details.

SEC_DIV

A, I

Secondary PWM frequency divider input. Connect an external resistor (5%) from this input to

ground to set the Secondary PWM clock divider for either internal or external (if the CLK_IN

input is active) PWM clocking operation.

Note that the Secondary PWM clocking rate is a function of this SEC_DIV divider ratio. See

PWM Clock Generation description for details.

Primary-Side: Inputs & Outputs

GPIP

I, PU

General purpose digital input on primary side, referenced to 48N. See GPIO operation.

GPOP

General purpose digital output on primary side, referenced to 48N. See GPIO operation.

ADCIN

A, I

General purpose ADC input, referenced to 48RTN.

I2C_ADR

A, I

Sets the AS1860 I2C device address. One of 8 possible Device addresses is configured by

connecting a resistor on this input to ground (48N). As a result of the chosen resistor, 3 bits

of available addressing for the device are configured. See Table 20 for resistor values and

other details.

WD_MODE

Watchdog Timer mode. Enables/disables watchdog timer and sets timer period, operation

also varies with MODE input setup.

For Hardware Mode Operation:

WD_MODE = Low (connect to 48N): watchdog off.

WD_MODE = Capacitor to 48N: A 1 second timeout generates a PGOOD output transition.

WD_MODE = High (connect to VDD3V_OUT): A 32 second timeout generates a PGOOD

output transition.

For Software Mode Operation:

WD_MODE = Low (connect to 48N): watchdog off.

WD_MODE = Capacitor to 48N: Power-on enables watchdog usage and counter starts (at

max count) after PGOOD indicates good power. Use the Watchdog Timeout Register to

change timeout count. Watchdog servicing is via Hardware or I2C commands.

WD_MODE = High (connect to VDD3V_OUT): Power-on enables watchdog usage but waits

for software to enable before starting. Use Watchdog Timeout Register for timeout length

(reset to max). Watchdog servicing is via Hardware pin or I2C commands.

AS1860 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers

AS1860 Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Datasheet Download

Link URL