2 Technical Data
2.1 Hardware
•
CPU: ARM Cortex M4 (STM32F405RG in Olimex STM32-H405).
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Speed: 168 MHz while computing, 8 MHz while waiting for user input.
•
Overclocking: a 200 MHz turbo and a 240 MHz hypercharge can be configured.
•
ROM: 1 MB.
•
RAM: 192 kB + 4 kB backup-RAM.
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Display: text display with 4
×
20 characters, plus a red LED, a green LED and a
buzzer.
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Display backlight: controlled by software.
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Input: 4
×
4 matrix keypad plus one switch for manual backlight activation.
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Power input: 4
×
AA rechargeable NiMH batteries or via 5 V DC wall power adapter.
Non-rechargeable batteries are also suitable, though not economic.
•
Battery running time with 2200 mAh NiMH batteries, assuming 90% usable battery
capacity:
37.5 hours (168 MHz regular).
33.5 hours (200 MHz turbo).
30
hours (240 MHz hypercharge).
42
hours (144 MHz eco).
•
Current consumption at 5 V:
18 mA while waiting for user input.
81 mA while computing without overclocking.
93 mA while computing at 200 MHz (turbo).
107 mA while computing at 240 MHz (hypercharge).
70 mA while computing at 144 MHz (eco).
each plus 28 mA with active display backlight.
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