application note ? an593 / 03,93 st62 in-circuit programming figure 1. 16-pin pcb socket connection in-circuit programming this note provides information on the steps required in order to perform in-circuit pro- gramming of st62exx eprom or otp devices for both on-chip eprom and eeprom. in-circuit eprom programming is possible if the relevant pins of the programming socket located on the st62 eprom programming tool (either the st6 starter kit, re- mote programming board or gang programmer) are connected to a 16-pin connector (8x2 header he10), which must be provided on the application board by the customer. note: in-circuit programming embedded in production test is not possible. if the eprom programmer cable is connected to the application, the reset signal for in- stance is tied to gnd before and after programming. in circuit programming procedure the procedure for in-circuit programming is as follows: - power up the pc and invoke the st6 eprom programmer software. 1/3
- connect the programmer to the application board which must be in the power off condition. - power on the application board (+5v) and use the st6 eprom programmer soft- ware in the usual way. the target chip may be supplied by the programmer (in the case where the power supply of the chip can be separated from the remaining parts of the application). only a few signals of the 16-pin cable are used. these are listed below including their functional characteristics, seen from the programming tool point of view, and the inter- connection to st62 family members: the signals shown in figure 1 should be completely separated from the application circuitry for the time of programming and all signals must be connected to the st62exx on the application board. in addition it is mandatory to add a ceramic capaci- tor with a value of 100nf between v pp /tm and v ss ! separation of v ss to the application board gnd is not necessary. programming conditions if separation between the st62exx and its application circuitry is not possible, certain conditions concerning the application circuitry must be fullfilled: - v pp /tm (test) on the st62exx application must not be connected directly to v ss , instead it should be pulled down by a resistor with a minimum value of 10k w . it is mandatory to add a ceramic capacitor with a value of 100nf between v pp /tm and v ss ! - both eprom programmer pins for v ss must be connected to the v ss input of the st62exx to be programmed. - connection of the eprom programmmer pin v dd is optional (and not recom- mended). if the st62exx chip is supplied by the application power circuit, the supplied v dd voltage must be +5v to avoid excessive current through the st62exx cmos input protection diodes. if the st62exx is supplied by the pro- grammer, the total load current should not exceed 100ma and the capacitive load must be lower than 50 m f. - the reset pin on the application st62exx must be left open or pulled up by a resistor with a minimum value of 2k w . the capacitive load should not exceed 1 m f. - oscin on the application st62exx must not be connected to a clock generator. a quartz crystal or a ceramic resonator is allowed. - the programmer cable header's pin 1 and pin 3 are applied to different members of the st62exx families as shown in figure 1. these signals must not be con- nected to any other output on the application to prevent any voltage contention. pullup resistors of a minimum value of 2k w and pulldown resistors of 10k w mini- mum are allowed. note: the connection of pin 5 of the cable header is not necessary if a high voltage level on the st62exx pin is guaranteed. this pin is set to input with pullup mode dur- ing reset, meaning another pullup, or cmos inputs, are allowed for the application. ? st62 in-circuit programming 2/3
information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support devices or systems without the express written approval of sgs-thomson microelectronics. ? 1994 sgs-thomson microelectronics - all rights reserved. purchase of i 2 c components by sgs-thomson microelectronics conveys a license under the philips i 2 c patent. rights to use these components in an i 2 c system is granted provided that the system conforms to the i 2 c standard specification as defined by philips. sgs-thomson microelectronics group of companies australia - brazil - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the nether- lands singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. - pin 7 of the cable header is applied to the members of the st6 family, as shown in figure1. on the application board this signal must not be connected to any other output . a pullup resistor of a minimum value of 2k w and a pulldown resistor of 2k w minimum are allowed. - for st626x and st629x only: pin extal = oscout must be tied directly to v dd . pb7 must not be connected to any other output. pb6 must be at a high volt- age level. pb6 is set to input with pullup mode during reset, meaning another pul- lup, or cmos inputs, may be connected. - for st624x only: pin pb0 must be at a high voltage level. it is set to input with pullup mode during reset, meaning another pullup, or cmos inputs, may be con- nected. ? st62 in-circuit programming 3/3
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