IC-HTP datasheet(11/51 Pages) ICHAUS

11 / 51 page

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 11/51

iC-WK MODE

Setting pin EMC = lo configures iC-HTP for iC-WK

mode. EMC pin must be set using a pull-down resistor

or directly short-circuited to GND pin.

In iC-WK mode both channels operate in APC mode.

The internal programmable logarithmic monitor resis-

tors are disabled, therefore connection of external re-

sistors at pins MDKx is required.

The APC reference can be set to two different values by

means of pin INS/WKR, as it is explained in table 5, and

the overcurrent threshold is set to its maximum value

of 750 mA (cf. Electrical Characteristics No. 107). In

case of overcurrent, the respective channel is disabled.

For re-enabling the channel, the corresponding ECx pin

must be set lo and then back hi.

Reference Voltage in iC-WK mode

INS/WKR

Reference Voltage

VDD-0.125 V

VDD-0.250 V

Table 5: Reference selection (cf. Electrical Characteris-

tics No. 110 )

External CI capacitors must be added in this operation

mode at pins CIx and CIHx. Figure 3 shows an exam-

ple in iC-WK mode using an P-type laser diode, where

VDD-0.250 V reference is selected. Figure 4 presents

the same configuration with an P-type laser diode and

reference VDD-0.125 V.

CHECK

IO DRIVERS

RMD1(7:0)

0x12

0x18

REF2(9:8)

0x17

0x04

ADC1(7:0)

0x02

LASER CHANNEL 1

OVC

8 Bit

0.25V/0.125V

RM2

0x11

ILIM1(7:0)

CONTROL

Signal Level Converter

REF2(7:0)

REGISTERS

SPI/I2C

ADC2(7:0)

0x19

MEMERR

0x05

ADC2(9:8)

RM1

10 Bit

VDD UNDERVOLTAGE

..10 nF..

REF1(9:8)

1μF

ADCC1(2:0)

SLAVE

RAM

ILIM2(7:0)

WATCHDOG

TIMER

OSCILLATOR

LASER

0x06

TEMP(7:0)

ACC

PODO

0x10

1μF

MONITOR 8 Bit

RAM

0x03

ADC1(9:8)

..10 nF..

0x10

APC

8 Bit

255

0x1F

0x30

0x3F

RMD2(7:0)

INTEGRITY

OVT

0x16

LASER CHANNEL 2

VDD REGULATOR

TEMPERATURE

VB UNDERVOLTAGE

0x13

REF1(7:0)

DUAL CW LASER DIODE DRIVER

0x14

CFGTIMO

CI2

CVB

I LDA2

CI1

I LDA1

CVDD

MRH2

MDK2

VDD

EMC

DISP1

GND

MDK1

MRH1

CI1

DCO

GND

Check

NCHK

EC1

NSTBY

INS/WKR

MISO/SDA

SCLK/SCL

MOSI/A0

NCS/A1

EC2

EMC

T.PAD

VDD

REF

LDA1

OVC

CIH1

VBL1

CI2

VBL2

CIH2

LDA2

CVB

CI2

I LDA1

CI1

I LDA2

CVDD

Figure 3: iC-HTP in iC-WK mode with P-type laser diode and reference VDD-0.250V

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