Datasheet MAX7219, MAX7221 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | Serially Interfaced, 8-Digit, LED Display Drivers |
| Pages / Page | 15 / 9 — Table 7. Intensity Register Format (Address (Hex) = 0xXA). DUTY CYCLE. … |
| File Format / Size | PDF / 1.4 Mb |
| Document Language | English |
Table 7. Intensity Register Format (Address (Hex) = 0xXA). DUTY CYCLE. HEX. MAX7219. MAX7221. CODE
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MAX7219/MAX7221 Serially Interfaced, 8-Digit LED Display Drivers
Table 7. Intensity Register Format (Address (Hex) = 0xXA) DUTY CYCLE D7 D6 D5 D4 D3 D2 D1 D0 HEX MAX7219 MAX7221 CODE
1/32 1/16 (min on) (min on) X X X X 0 0 0 0 0xX0 3/32 2/16 X X X X 0 0 0 1 0xX1 5/32 3/16 X X X X 0 0 1 0 0xX2 7/32 4/16 X X X X 0 0 1 1 0xX3 9/32 5/16 X X X X 0 1 0 0 0xX4 11/32 6/16 X X X X 0 1 0 1 0xX5 13/32 7/16 X X X X 0 1 1 0 0xX6 15/32 8/16 X X X X 0 1 1 1 0xX7 17/32 9/16 X X X X 1 0 0 0 0xX8 19/32 10/16 X X X X 1 0 0 1 0xX9 21/32 11/16 X X X X 1 0 1 0 0xXA 23/32 12/16 X X X X 1 0 1 1 0xXB 25/32 13/16 X X X X 1 1 0 0 0xXC 27/32 14/16 X X X X 1 1 0 1 0xXD 29/32 15/16 X X X X 1 1 1 0 0xXE 31/32 15/16 (max on) X X X X 1 1 1 1 0xXF
Table 8. Scan-Limit Register Format (Address (Hex) = 0xXB) REGISTER DATA SCAN LIMIT HEX CODE D7 D6 D5 D4 D3 D2 D1 D0
Display digit 0 only* X X X X X 0 0 0 0xX0 Display digits 0 & 1* X X X X X 0 0 1 0xX1 Display digits 0 1 2* X X X X X 0 1 0 0xX2 Display digits 0 1 2 3 X X X X X 0 1 1 0xX3 Display digits 0 1 2 3 4 X X X X X 1 0 0 0xX4 Display digits 0 1 2 3 4 5 X X X X X 1 0 1 0xX5 Display digits 0 1 2 3 4 5 6 X X X X X 1 1 0 0xX6 Display digits 0 1 2 3 4 5 6 7 X X X X X 1 1 1 0xX7 *See Scan-Limit Register section for application.
Scan-Limit Register
8fOSC/N, where N is the number of digits scanned. Since The scan-limit register sets how many digits are displayed, the number of scanned digits affects the display bright- from 1 to 8. They are displayed in a multiplexed manner ness, the scan-limit register should not be used to blank with a typical display scan rate of 800Hz with 8 digits portions of the display (such as leading zero suppression). displayed. If fewer digits are displayed, the scan rate is Table 8 lists the scan-limit register format. www.maximintegrated.com Maxim Integrated │ 9
Table 7. Intensity Register Format (Address (Hex) = 0xXA) DUTY CYCLE D7 D6 D5 D4 D3 D2 D1 D0 HEX MAX7219 MAX7221 CODE
1/32 1/16 (min on) (min on) X X X X 0 0 0 0 0xX0 3/32 2/16 X X X X 0 0 0 1 0xX1 5/32 3/16 X X X X 0 0 1 0 0xX2 7/32 4/16 X X X X 0 0 1 1 0xX3 9/32 5/16 X X X X 0 1 0 0 0xX4 11/32 6/16 X X X X 0 1 0 1 0xX5 13/32 7/16 X X X X 0 1 1 0 0xX6 15/32 8/16 X X X X 0 1 1 1 0xX7 17/32 9/16 X X X X 1 0 0 0 0xX8 19/32 10/16 X X X X 1 0 0 1 0xX9 21/32 11/16 X X X X 1 0 1 0 0xXA 23/32 12/16 X X X X 1 0 1 1 0xXB 25/32 13/16 X X X X 1 1 0 0 0xXC 27/32 14/16 X X X X 1 1 0 1 0xXD 29/32 15/16 X X X X 1 1 1 0 0xXE 31/32 15/16 (max on) X X X X 1 1 1 1 0xXF
Table 8. Scan-Limit Register Format (Address (Hex) = 0xXB) REGISTER DATA SCAN LIMIT HEX CODE D7 D6 D5 D4 D3 D2 D1 D0
Display digit 0 only* X X X X X 0 0 0 0xX0 Display digits 0 & 1* X X X X X 0 0 1 0xX1 Display digits 0 1 2* X X X X X 0 1 0 0xX2 Display digits 0 1 2 3 X X X X X 0 1 1 0xX3 Display digits 0 1 2 3 4 X X X X X 1 0 0 0xX4 Display digits 0 1 2 3 4 5 X X X X X 1 0 1 0xX5 Display digits 0 1 2 3 4 5 6 X X X X X 1 1 0 0xX6 Display digits 0 1 2 3 4 5 6 7 X X X X X 1 1 1 0xX7 *See Scan-Limit Register section for application.
Scan-Limit Register
8fOSC/N, where N is the number of digits scanned. Since The scan-limit register sets how many digits are displayed, the number of scanned digits affects the display bright- from 1 to 8. They are displayed in a multiplexed manner ness, the scan-limit register should not be used to blank with a typical display scan rate of 800Hz with 8 digits portions of the display (such as leading zero suppression). displayed. If fewer digits are displayed, the scan rate is Table 8 lists the scan-limit register format. www.maximintegrated.com Maxim Integrated │ 9