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content/hp34970a_2.rst@42a19a0d1c99 (annotated)

content/hp34970a_2.rst

Thu, 05 Nov 2020 23:28:39 +0100

author
David Douard <david.douard@sdf3.org>
date
Thu, 05 Nov 2020 23:28:39 +0100
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Add a few missing :alt: to images

far from being done everywhere however...

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1 ==========================================
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2 HP 34970A Data Acquisition Unit - part 2
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3 ==========================================
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4
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5 :Author: David Douard
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6 :Category: Electronics
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7 :Tags: HP, 34970A, DMM, repair, test equipment
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8 :series: HP 34970A repair
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9 :series_index: 2
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12 This is quick follow up of my `previous blog
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13 post <{filename}/hp34970a.rst>`_ on my attempt to fix my recently acquired
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14 HP 34970A.
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16 In my hurry to replace the failing FRAM (FM24C04) chips, I also
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17 replaced the FRAM chip on one of my 2 plugin modules.
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18
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19 Bad idea: the module then provoques an error on startup (something
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20 related to the memory being incorrect).
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22 So I decided to try to dump the content of the memory on copy it into
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23 a brand new chip. The FRAM chips on the plugin modules are much less
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24 prone to fail, but I would not have been pleased to be obliged to
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25 reinstall the original chip...
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27 At this point, I had 2 problems:
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29 - I don't have a universal programmer (yet),
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30
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31 - I don't which one of the 3 FM24C04 is the one from the plugin
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32 modules (the other 2 are from the main board and the DMM).
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33
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34 Dumping the FRAM chips
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35 ======================
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36
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37 I don't have a programmer, but I have some Arduino Uno laying
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38 around. So let's use it as a poor man's mem dumper/programmer.
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39
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40 My first problem has been to build a setup to install the SOIC8 chips
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41 on, connect the 2 pull-up resistors and wire it to the Arduino.
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42
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43 I ended with this:
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44
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45 .. image:: {static}/images/hp34970a/soic8_breadboard.jpg
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46 :alt: the breadboard-based setup to dump/write the FM24C04 chips.
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47
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48 And with a FM24C04 chip soldered on:
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50 .. image:: {static}/images/hp34970a/soic8_breadboard_populated.jpg
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51 :alt: the breadboard-based setup with a FM24C04 to be dumped.
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53 I've been using a small library named extEEPROM_ dedicated to
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54 reading/writing I2C EEPROM chips. My problem was I was not able to get
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55 any acnkoledge from any FM24C04 I "plugged" on my board. It was
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56 working properly with a MAG3110 or a PCF8563 I have, but not wth the
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57 FM24C04.
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58
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59 According to the datasheet I have (FM24C04U from Fairchild), the chip
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60 is supposed to accept a wide range of voltage (from 2.7v to 5.5v), so
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61 I used the 3.3v pin of the Arduino to power the chip. That was the
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62 problem: using a 5v power rail made meable to dump the content of the
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63 chips.
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65 .. image:: {static}/images/hp34970a/fm24c04_dump.jpg
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66 :alt: dumping the content of a FM24C04
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67
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68 Restoring the dumped content in a new FM24C04
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69 =============================================
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71 Now I have 3 candidates.
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73 First::
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75 0x0000 3C 84 7C 6C 57 57 6C 7C 84 3C 3F 71 BD 2A 68 68
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109 Second::
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133 0x0160 FF FF FF FF FF FF FF FF 01 00 00 00 00 00 00 00
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134 0x0170 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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135 0x0180 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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136 0x0190 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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137 0x01A0 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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138 0x01B0 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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139 0x01C0 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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140 0x01D0 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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141 0x01E0 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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142 0x01F0 FF FF FF FF FF FF FF FF 00 00 00 00 00 00 00 00
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143
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144
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145 Third::
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146
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147 0x0000 01 0C 00 00 00 1A 00 00 22 1A 00 0A 80 46 FE 77
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148 0x0010 37 B5 57 DB CA 6E FB 6F 3F EC F9 FB DE FF FF 77
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149 0x0020 F7 04 7D FF FB FE FA 67 77 FD DD FB DF FF FF 76
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150 0x0030 37 BC 59 FB FF 7E FA 66 37 E5 D9 FF FB EE FF F7
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151 0x0040 BF 45 77 FB FA FF FA 77 3F ED 51 FF DE FF FF FE
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152 0x0050 37 27 51 DB DF FE FA 66 B7 EC 7F FB EE FE FE F6
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153 0x0060 37 F5 D2 FF CB EE FE 6F FF 65 71 FF FF FF FE 7F
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154 0x0070 3F 4E 71 FF CF FE FF 67 BF BD 5D FF FE FE FE 7F
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155 0x0080 37 04 55 DF EA EE FF 6E F7 E5 7F FF DE FF FE 7E
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156 0x0090 FF 0C 70 FF FF FF FA 6E FF FD 7F FF DE FE FF 76
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157 0x00A0 3F 3D 71 DF FE FE FB 6E B7 E5 FD FB DF FF FE FF
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158 0x00B0 FF 7F FF DB DB FF FE 6F BF FD F9 FB EA FF FE FE
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159 0x00C0 F7 E3 FB BB FF FE FB 66 F7 6C D1 FB DF FE FE F6
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160 0x00D0 B7 64 7D EB DF FE FB 76 3F F5 F1 FF DB FE FF E6
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161 0x00E0 BF C6 D6 DB CA EF FA 76 B7 F5 7F FF FE FE FF 7F
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162 0x00F0 B7 6E 41 DB CA 7E FB EE FF FF FF FF FF FF FF 7F
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163 0x0100 11 00 00 00 00 00 C0 00 FF FF FF FF FF FF FF FF
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164 0x0110 11 00 00 02 00 00 00 20 FF FF FF FF FF FF FF FF
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165 0x0120 11 00 00 00 02 00 00 00 FF FF FF FF FF FF FF FF
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166 0x0130 11 00 00 02 00 20 18 00 FF FF FF FF FF FF FF FF
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167 0x0140 11 00 00 02 80 00 08 00 FF FF FF FF FF FF FF FF
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168 0x0150 11 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF
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169 0x0160 11 00 00 00 02 00 50 00 FF FF FF FF FF FF FF FF
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170 0x0170 11 00 00 02 00 00 00 00 FF FF FF FF FF FF FF FF
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171 0x0180 11 00 00 00 00 00 D0 00 FF FF FF FF FF FF FF FF
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172 0x0190 01 00 00 00 00 08 08 02 FF FF FF FF FF FF FF FF
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173 0x01A0 11 00 00 00 00 00 08 20 FF FF FF FF FF FF FF FF
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174 0x01B0 11 00 00 00 00 00 08 00 FF FF FF FF FF FF FF FF
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175 0x01C0 13 00 00 08 02 00 08 00 FF FF FF FF FF FF FF FF
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176 0x01D0 11 00 00 08 00 00 18 00 FF FF FF FF FF FF FF FF
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177 0x01E0 11 00 00 00 00 00 90 00 FF FF FF FF FF FF FF FF
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178 0x01F0 01 00 00 00 00 00 08 00 FF FF FF FF FF FF FF FF
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179
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180
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181 The notable thing about the first one is the absence of long 0xFF
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182 patterns. So I chose it as a first guess, and I was right.
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183
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184 Now my HP 34970A does not complainany more at all on startup!
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185
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186 So I "just" have to fix the display (and recalibrate it). But "just"
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187 fixing the display looks a not so easy task, since my display unit
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188 microcontroller (U1) seems to be partially dead.
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189
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190 But that's an other story.
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191
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192 .. _extEEPROM: https://github.com/JChristensen/extEEPROM

Mercurial Repository: whatever

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