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PAS6352 specification all rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission. 1 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 PAS6352 cmos vga image sensor general description the PAS6352 is a highly integrated cmos active-pixel image sensor that has output of 640 x 480 pixels. it embedded the new finepixel ? sensor technology to perform the excellent image quality. PAS6352 outputs 10- bit rgb raw or yuv/ycrcb 4:2:2 or rgb565/555/444 data through a parallel data bus. it is available in csp package. the PAS6352 can be programmed to set the exposure time for different luminance condition via i2c tm serial control bus. by programming the internal register set, it performs on-chip frame rate adjustment and programmable gain control. key specification active pixel 648(h) x 488(v) resolution 640 (h) x 480 (v) analog 2.8v i/o 1.7v ~ 3.3v power core 1.8v [ array diagonal ] 1/4 lens pixel size 5.6um * 5.6um lens chief ray angle tbd max. frame rate vga 60fps max. input clock 48 mhz max. pixel clock 48 mhz, vga yuv 60fps sensitivity tbd color filter rgb bayer pattern exposure time tbd scan mode progressive s/n ratio tbd dynamic range tbd features active pixels: 648 x 488 pixels resolution: 640 x 480 pixels, 1/4 lens bayer-rgb color filter array output format : l raw, 10-bit l yuv/ycrcb 4:2:2 l rgb565/555/444 on-chip 10-bit pipelined a/d converter on-chip manual analog gain control continuous variable frame time & exposure time i2c tm interface support 1.7v~3.3v i/o power dissipation: operating typ. tbd@ 2.8v (vga yuv 60fps parallel-output, without loading), low power-down dissipation typ./max. tbd @ 2.8v automatic background compensation isp function: l aec & agc l awb l gamma l color matrix l sharpness l de-noise l color saturation l defect compensation l lens shading compensation l auto de-flicker l decimation-avg and scaler l drc (dynamic range compensation) l woi & sub-sampling dummy line & pixel timing output hsync at vsync pll module size : tbd package csp
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 2 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 1. pin assignment PAS6352lt (top-view) pin no. name type description a1 vdd18k_i pwr digital core power, 1.8v typical a2 vssd gnd ground a3 pxd11 out digital pixel data [5] a4 pxd9 out digital pixel data [3] a5 iovdd pwr i/o power, 2.8v typical a6 pxclk out pixel clock output a7 pxd6 out digital pixel data [0], lsb a8 vssd gnd ground a9 vdd18k_i pwr digital core power, 1.8v typical b1 hsync out horizontal synchronization signal output b2 pxd13 out digital pixel data [7], msb b3 vsync out vertical synchronization signal output b4 pxd8 out digital pixel data [2] b5 pxd7 out digital pixel data [1] b6 pxd4 out digital pixel data for raw mode b7 pxd5 out digital pixel data for raw mode b8 dvdd28 pwr main power, 2.8v typical b9 sysclk in external clock input c1 pxd2 -- nc c2 vssd gnd ground
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 3 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 c3 pxd10 out digital pixel data [4] c7 pxd12 out digital pixel data [6] c8 vssd gnd ground c9 pxd3 -- nc d1 iovdd pwr i/o power, 2.8v typical d2 vdd18k_i pwr digital core power, 1.8v typical d8 vddref ref voltage reference d9 iovdd pwr i/o power, 2.8v typical e1 sda i/o i2c data e2 scl in i2c clock input e3 fsource -- nc e6 vssd gnd ground e7 vssd gnd ground e8 vdday ref voltage reference e9 vssa gnd ground f1 avdd28 pwr main power, 2.8v typical f2 vssa gnd ground f3 rstn in chip reset mode enable, active low f4 framesync -- test pin f5 iovdd pwr i/o power, 2.8v typical f6 vssd gnd ground f7 csb in power down mode enable, active high f8 vssay gnd ground f9 avdd28 pwr main power, 2.8v typical
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 4 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 2. i2c tm bus PAS6352 supports i2c bus transfer protocol and acts as slave device. the 7-bits unique slave address is 1000000 and supports receiving / transmitting speed as maximum 400khz. i2c bus overview l only two wires sda ( serial data ) and scl ( serial clock ) carry information between the devices connected to the i2c bus. normally both sda and scl lines are open collector structure and pulled high by external pull-up resistors. l only the master can initiates a transfer ( start ), generates clock signals, and terminates a transfer ( stop ). l start and stop condition : a high to low transition of the sda line while scl is high defines a start condition. a low to high transition of the sda line while scl is high defines a stop condition. please refer to figure 2.1. l valid data : the data on the sda line must be stable during the high period of the scl clock. within each byte, msb is always transferred first. read / write control bit is the lsb of the first byte. please refer to figure 2.2. l both the master and slave can transmit and receive data from the bus. l acknowledge : the receiving device should pull down the sda line during high period of the scl clock line when a complete byte was transferred by transmitter. in the case of a master received data from a slave, the master does not generate an acknowledgment on the last byte to indicate the end of a master read cycle. figure 2.1 start and stop conditions figure 2.2 valid data
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 5 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 data transfer format master transmits data to salve ( write cycle ) l s : start. l a : acknowledge by salve. l p : stop. l rw : the lsb of 1 st byte to decide whether current cycle is read or write cycle. rw = 1 C read cycle, rw = 0 C write cycle. l subaddress : the address values of PAS6352 internal control registers. ( please refer to PAS6352 register description ) during write cycle, the master generates start condition and then places the 1 st byte data that are combined slave address ( 7 bits ) with a read / write control bit to sda line. after slave ( PAS6352 ) issues acknowledgment, the master places 2 nd byte ( sub address ) data on sda line. again follow the PAS6352 acknowledgment, the master places the 8 bits data on sda line and transmit to PAS6352 control register ( address was assigned by 2 nd byte ). after PAS6352 issues acknowledgment, the master can generate a stop condition to end of this write cycle. in the condition of multi-byte write, the PAS6352 sub-address is automatically increment after each data byte transferred. the data and a cycles is repeat until last byte write. every control registers value inside PAS6352 can be programming via this way. slave transmits data to master ( read cycle ) l the sub-address was taken from previous write cycle. l the sub-address is automatically increment after each byte read. l am : acknowledge by master. l note there is no acknowledgment from master after last byte read. during read cycle, the master generates start condition and then place the 1 st byte data that are combined slave address ( 7 bits ) with a read / write control bit to sda line. after issue acknowledgment, 8 bits data was also placed on sda line by PAS6352. the 8 bits data was read from PAS6352 internal control register that address was assigned by previous write cycle. follow the master acknowledgment, the PAS6352 place the next 8 bits data ( address is increment automatically ) on sda line and then transmit to master serially. the data and am cycles is repeat until the last byte read. after last byte read, am is no longer generated by master but instead by keep sda line high. the slave ( PAS6352 ) must releases sda line to master to generate stop condition.
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 6 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 7 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 i2c tm bus timing i2c tm bus timing specification standard mode parameter symbol min. max unit scl clock frequency. f scl 10 400 khz hold time ( repeated ) start condition. after this period, the first clock pulse is generated. t hd:sta 4.0 - s low period of the scl clock. t low 4.7 - s high period of the scl clock. t high 0.75 - s set-up time for a repeated start condition. t su;sta 4.7 - s data hold time. for i2c-bus device. t hd;dat 0 3.45 s data set-up time. t su;dat 250 - ns rise time of both sda and scl signals. t r 30 n.d. ns ( notel ) fall time of both sda and scl signals. t f 30 n.d. ns ( notel ) set-up time for stop condition. t su;sto 4.0 - s bus free time between a stop and start. t buf 4.7 - s capacitive load for each bus line. c b 1 15 pf noise margin at low level for each connected device. ( including hysteresis ) v nl 0.1 vdd - v noise margin at high level for each connected device. ( including hysteresis ) v nh 0.2 vdd - v note : it depends on the high period time of scl.
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 8 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 3. registers register table bank address register name description 0 f [7:0] r_awb_window_x[7:0] awb window width (by4) 0 11 [7:0] r_awb_window_y[7:0] awb window height (by4) 0 19 [7:0] r_awb_dgnr_lb_by2[7:0] awb digital gain lower bound for r 0 1a [7:0] r_awb_dgnr_ub_by2[7:0] awb digital gain upper bound for b 0 1b [7:0] r_awb_dgnb_lb_by2[7:0] awb digital gain lower bound for b 0 1c [7:0] r_awb_dgnb_ub_by2[7:0] awb digital gain upper bound for r 0 1f [4] r_denoiseen denoise enable 0 20 [7:0] r_denoise_str__g[7:0] denoise strength (for color g) 0 23 [7:0] r_denoise_str__rb[7:0] denoise strength (for color r/b) 0 28 [7:0] r_isp_yed isp gamma yed (256) 0 29 [0] r_isp_gamma_enh isp gamma correction enable 0 2a [7:0] r_isp_y00 isp gamma y0 (4) 0 2b [7:0] r_isp_y01 isp gamma y1 (8) 0 2c [7:0] r_isp_y02 isp gamma y2 (16) 0 2d [7:0] r_isp_y03 isp gamma y3 (32) 0 2e [7:0] r_isp_y04 isp gamma y4 (40) 0 2f [7:0] r_isp_y05 isp gamma y5 (48) 0 30 [7:0] r_isp_y06 isp gamma y6 (56) 0 31 [7:0] r_isp_y07 isp gamma y7 (64) 0 32 [7:0] r_isp_y08 isp gamma y8 (80) 0 33 [7:0] r_isp_y09 isp gamma y9 (96) 0 34 [7:0] r_isp_y10 isp gamma y10 (112) 0 35 [7:0] r_isp_y11 isp gamma y11 (128) 0 36 [7:0] r_isp_y12 isp gamma y12 (160) 0 37 [7:0] r_isp_y13 isp gamma y13 (192) 0 38 [7:0] r_isp_y14 isp gamma y14 (224) 0 47 [1:0] r_awb_speed awb adjust speed. the more, the slower 0: 1 x 1: 1/2 x 2: 1/4 x 3: 1/8 x 0 49 [7:0] r_awb_sumratio_b awb b sum ratio = 128/x 0 4a [7:0] r_awb_sumratio_r awb r sum ratio = 128/x 0 4d [7:0] r_awb_cbthdl[7:0] awb region test cb low threshold -128 ~ +127 (2's complement) 0 4e [7:0] r_awb_crthdl[7:0] awb region test cr low threshold -128 ~ +127 (2's complement) 0 4f [7:0] r_awb_cbcrthdl[7:0] awb region test cb+cr low threshold -128 ~ +127 (2's complement) 0 50 [7:0] r_awb_cbthdh[7:0] awb region test cb high threshold -128 ~ +127 (2's complement) 0 51 [7:0] r_awb_crthdh[7:0] awb region test cr high threshold -128 ~ +127 (2's complement) 0 52 [7:0] r_awb_cbcrthdh[7:0] awb region test cb+cr high threshold -128 ~ +127 (2's complement) 0 53 [7:0] r_ylow low bound of light-pixel y in awb 0 54 [7:0] r_yhigh high bound of light-pixel y in awb
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 9 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 0 66 [4] r_ae_enh ae enable 0 66 [0] r_freq_60 set de-flicker frequency 0/1: 50/60hz 0 67 [7:0] r_sysclk_freq[7:0] input_frequency/2048 0 68 [6:0] r_sysclk_freq[14:8] input_frequency/2048 0 69 [7:0] r_denoise_str__g__hs[7:0] denoise strength (for color g) in hs mode 0 6a [7:0] r_denoise_str__rb_hs[7:0] denoise strength (for color r/b) in hs mode 0 6b [4:0] r_ae_minstage[4:0] minimum ae stage 0 6c [4:0] r_ae_maxstage[4:0] maximum ae stage (ae_maxstage<=31) 0 6d [7:0] r_ag_stage_ub ag_stage upper bound at max ae_stage (0:2x; 16:4x, 32:8x, 48:16x, 64:32x, 80:64x, 96:128x) 0 6f [7:0] r_ytar8bit 0~255, target luminance of ae 0 72 [0] r_awb_enh auto-white balance enable 0 72 [4] r_awb_gain_rst awb gain reset 0 79 [7:0] r_isp_hoffset[7:0] isp hsize offset 0 7b [7:0] r_isp_voffset[7:0] isp vsize offset 0 81 [5:4] r_ae_speed ae speed, the more, the slower 0: 1 x 1: 1/2 x 2: 1/4 x 3: 1/8 x 0 8f [7:0] r_imgeffect_c0 image effect parameter 0 (isp_updateflag=1, update ) 0 90 [7:0] r_imgeffect_c1 image effect parameter 1 (isp_updateflag=1, update ) 0 91 [7:0] r_imgeffect_c2 image effect parameter 2 (isp_updateflag=1, update ) 0 93 [3:0] r_imgeffectmode image effect mode 0: monochrome 1: negative 2: x-ray 3: sepia/cold/warm/sunset 6: solarize 10: pixelate (isp_updateflag=1, update ) 0 94 [0] r_isp_imgeffect_en 1: image effect function enable (isp_updateflag=1, update ) 0 97 [4] r_shading_enh lens shading enable 0 99 [6:0] r_offsetx_r[6:0] horizontal distances between shading center and sensor array center of r-channel, msb:sign bit, -63~+63 0 9a [6:0] r_offsety_r[6:0] vertical distances between shading center and sensor array center of r-channel, msb:sign bit, -63~+63
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 10 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 0 9b [6:0] r_offsetx_g[6:0] horizontal distances between shading center and sensor array center of g-channel, msb:sign bit, -63~+63 0 9c [6:0] r_offsety_g[6:0] vertical distances between shading center and sensor array center of g-channel, msb:sign bit, -63~+63 0 9d [6:0] r_offsetx_b[6:0] horizontal distances between shading center and sensor array center of b-channel, msb:sign bit, -63~+63 0 9e [6:0] r_offsety_b[6:0] vertical distances between shading center and sensor array center of b-channel, msb:sign bit, -63~+63 0 9f [5:0] r_lsc_r1[5:0] quartic parameter of r-channel 0 a0 [5:0] r_lsc_g1[5:0] quartic parameter of g-channel 0 a1 [5:0] r_lsc_b1[5:0] quartic parameter of b-channel 0 a2 [5:0] r_lsc_r2[5:0] square parameter of r-channel 0 a3 [5:0] r_lsc_g2[5:0] square parameter of g-channel 0 a4 [5:0] r_lsc_b2[5:0] square parameter of b-channel 0 a5 [2:0] r_lsft_1[2:0] lens shading coefficient coarse shift value 0 a6 [1:0] r_lsft_2[1:0] lens shading coefficient coarse shift value 0 a7 [1:0] r_lsft_3[1:0] lens shading coefficient coarse shift value 0 a8 [1:0] r_lsft_4[1:0] lens shading coefficient coarse shift value 2 8 [7:0] r_imgeffect_y_offset[7:0] y offset value 2 9 [7:0] r_imgeffect_u_offset[7:0] u offset value 2 a [7:0] r_imgeffect_v_offset[7:0] v offset value 2 b [0] r_isp_imgeffect_1_en yuv value offset enable 2 2a [7] r_isp_edge_en0 isp edge enhancement enable 2 2f [4:0] r_ae_stage_ll[4:0] (ae_stage >= r_ae_stage_ll) && (ag_stage >= r_ag_stage_ll) =>low light 2 30 [4:0] r_ae_stage_nl[4:0] (ae_stage <= r_ae_stage_nl) && (ag_stage <= r_ag_stage_nl) =>normal light 2 32 [7:0] r_ag_stage_ll[7:0] (ae_stage >= r_ae_stage_ll) && (ag_stage >= r_ag_stage_ll) =>low light 2 33 [7:0] r_ag_stage_nl[7:0] (ae_stage <= r_ae_stage_nl) && (ag_stage <= r_ag_stage_nl) =>normal light 2 56 [4:0] r_edgeratio_delta[4:0] increment when ae/ag state change 2 57 [4:0] r_edgeratio_ll[4:0] edge ratio @low light 2 58 [4:0] r_edgeratio_nl[4:0] edge ratio @normal light 2 5a [4:0] r_edge_th_delta[4:0] increment when ae/ag state change 2 5b [7:0] r_edge_th_ll[7:0] edge threshold @ low light 2 5c [7:0] r_edge_th_nl[7:0] edge threshold @ normal light 2 5d [1] r_saturation_2x color saturation double 2 5e [4:0] r_saturation_delta[4:0] increment when ae/ag state change 2 5f [4:0] r_saturation_ll[4:0] color saturation @ low light 2 60 [4:0] r_saturation_nl[4:0] color saturation @ normal light
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 11 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 2 62 [4:0] r_shading_cp_r_delta[4:0] increment when ae/ag state change 2 63 [3:0] r_shading_cp_r_nl[3:0] shading compensation percentage @normal light 2 63 [7:4] r_shading_cp_r_ll[3:0] shading compensation percentage @low light 2 64 [0] r_contrast_en contrast enable 2 69 [7:0] r_brightness_ll[7:0] brightness @ low light 2 6a [7:0] r_brightness_nl[7:0] brightness @ normal light 2 9b [1:0] r_isp_woi_hsize[9:8] output image hsize (isp2_updateflag=1, update ) 2 9c [7:0] r_isp_woi_hsize[7:0] output image hsize (isp2_updateflag=1, update ) 2 9d [1:0] r_isp_woi_vsize[9:8] output image vsize (isp2_updateflag=1, update ) 2 9e [7:0] r_isp_woi_vsize[7:0] output image vsize (isp2_updateflag=1, update ) 2 9f [1:0] r_isp_woi_hoffset[9:8] output image h offset (isp2_updateflag=1, update ) 2 a0 [7:0] r_isp_woi_hoffset[7:0] output image h offset (isp2_updateflag=1, update ) 2 a1 [1:0] r_isp_woi_voffset[9:8] output image v offset (isp2_updateflag=1, update ) 2 a2 [7:0] r_isp_woi_voffset[7:0] output image v offset (isp2_updateflag=1, update ) 2 b0 [7] r_scaler_x_en scaling down x enable (isp2_updateflag=1, update ) 2 b0 [5:0] r_scaledenr_x[5:0] scaling down 16/x , 15 pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 12 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 3 4 [7:0] r_ccma0_0[7:0] accm base matrix coefficient 3 5 [7:0] r_ccma0_1[7:0] accm base matrix coefficient 3 6 [7:0] r_ccma0_2[7:0] accm base matrix coefficient 3 7 [7:0] r_ccma1_0[7:0] accm base matrix coefficient 3 8 [7:0] r_ccma1_1[7:0] accm base matrix coefficient 3 9 [7:0] r_ccma1_2[7:0] accm base matrix coefficient 3 a [7:0] r_ccma2_0[7:0] accm base matrix coefficient 3 b [7:0] r_ccma2_1[7:0] accm base matrix coefficient 3 c [7:0] r_ccma2_2[7:0] accm base matrix coefficient
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 13 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 4. reference circuit schematic 2v8 2v8 2v8 2v8 2v8 2v8 2v8 1v8 1v8 1v8 agnd agnd dgnd agnd agnd agnd agnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd dgnd agnd dgnd 2v8 +5v scl sda +5v 2v8 pxd4 pxd7 pxd11 pxd8 pxd9 pxclk pxd6 vsync pxd12 sysclk pxd5 rstn csb pxd13 pxd10 scl sda hsync 1v8 r2 10k 1 2 u1 PAS6352lt a1 a2 b3 a3 b4 a4 b5 a5 b6 a6 a7 a8 b7 b8 c7 c8 d8 e8 f8 f7 f6 f5 f4 f3 e3 f9 f1 e2 e1 d2 d1 c2 c1 c3 b1 b2 a9 b9 d9 e9 f2 c9 e6 e7 vdd18k_i vssd vsync pxd11 pxd8 pxd9 pxd7 iovdd pxd4 pxclk pxd6 vssd pxd5 dvdd28 pxd12 vssd vddref vdday vssay csb vssd iovdd framesync rstn fsource avdd28 avdd28 scl sda vdd18k_i iovdd vssd pxd2 pxd10 hsync pxd13 vdd18k_i sysclk iovdd vssa vssa pxd3 vssd vssd c11 0.1uf c2 0.1uf c1 0.1uf c8 0.1uf c7 0.1uf c14 1uf l1 0 c6 0.1uf 1 2 c5 10uf 1 2 vin pad u2 1.8v ldo 1 2 3 gnd vin vout c4 0.1uf c3 10uf 1 2 vin pad u3 2.8v ldo 1 2 3 gnd vin vout c13 0.1uf 1 2 c12 10uf 1 2 c10 0.1uf c9 10uf 1 2 r1 10k 1 2
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 14 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 5. package information
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 15 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 recommended pcb layout
pixart imaging inc. PAS6352 cmos image sensor ic all rights strictly reserved any portion in this paper shall no t be reproduced, copied or transformed to any other forms without permission. 16 pixart imaging inc. e -mail: fae_service@pixart.com.tw v0.6, 2012/11/13 recommended guideline for pcb assembly recommended vender and type for pb-free solder paste 1. almit lfm-48w tm-hp 2. senju m705-grn360-k ir reflow soldering profile: temperature profile is the most important control in reflow soldering. it must be fine tuned to establish a robust process. the typical recommended ir reflow profile is showed in figure below. ir reflow profile reflow profile : 1. average ramp-up rate (30 c to preheat zone): 1.5~ 2.5 degree c/ sec 2. preheat zone: 2.1 temp ramp from 170~ 200 degree c 2.2 exposure time: 90 +/- 30 sec 3. melting zone: 3.1 melting area temp > 220 degree c for at least 30 ~ 50 sec 3.2 peak temperature : 245 degree c. others: epoxy under-filled process is required post ic mounting process. dispense epoxy epoxy under-filled epoxy

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